Storage\Root folder not found following NC 33 update.

[fredcwells]

Describe the bug

Getting the following error following NC update to 33.0.0

Class "OC\Preview\Storage\Root" not found

Steps To Reproduce

1. Open Memories in Web or Android App.
2. View error in nextcloud.log

Platform

- OS:  Linux
- Browser: Brave (chromium)
- Memories Version: 7.8.2
- Nextcloud Version: 33.0.0
- PHP Version: 8.4.17

Screenshots

No response

Additional context

• Any errors in the JS console?

• Any errors in the Nextcloud server logs?

{"reqId":"aZd52rViK8e5oETsxtg4DQAA0xg","level":3,"time":"2026-02-19T21:00:11+00:00","remoteAddr":"24.216.178.81","user":"fred","app":"index","method":"POST","url":"/index.php/apps/memories/api/image/multipreview","scriptName":"/index.php","message":"Class "OC\Preview\Storage\Root" not found","userAgent":"MemoriesNative/1.15 Mozilla/5.0 (Linux; Android 16; SM-S931U Build/BP2A.250605.031.A3; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/144.0.7559.132 Mobile Safari/537.36","version":"33.0.0.16","exception":{"Exception":"Error","Message":"Class "OC\Preview\Storage\Root" not found","Code":0,"Trace":[{"file":"/var/www/nextcloud/apps/memories/lib/UtilController.php","line":53,"function":"{closure:OCA\Memories\Controller\ImageController::multipreview():99}","class":"OCA\Memories\Controller\ImageController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":210,"function":"callback","class":"OCP\AppFramework\Http\Response@anonymous\u0000/var/www/nextcloud/apps/memories/lib/UtilController.php:41$8e","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\AppFramework\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":1155,"function":"match","class":"OC\Route\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/apps/memories/lib/Controller/ImageController.php","Line":120,"message":"Class "OC\Preview\Storage\Root" not found","exception":"{"class":"Error","message":"Class \"OC\Preview\Storage\Root\" not found","code":0,"file":"/var/www/nextcloud/apps/memories/lib/Controller/ImageController.php:120","trace":"#0 /var/www/nextcloud/apps/memories/lib/UtilController.php(53): OCA\Memories\Controller\ImageController->{closure:OCA\Memories\Controller\ImageController::multipreview():99}()\n#1 /var/www/nextcloud/lib/private/AppFramework/App.php(210): OCP\AppFramework\Http\Response@anonymous->callback()\n#2 /var/www/nextcloud/lib/private/Route/Router.php(321): OC\AppFramework\App::main()\n#3 /var/www/nextcloud/lib/base.php(1155): OC\Route\Router->match()\n#4 /var/www/nextcloud/index.php(25): OC::handleRequest()\n#5 {main}"}","CustomMessage":"Class "OC\Preview\Storage\Root" not found"}}

[EVOTk]

Hello same issue for me.

Nextcloud crash after accessing to Memories.

In logs i'm have :

{"reqId":"kWn6O8YVgcSSOyUg3TVH","level":3,"time":"2026-02-20T12:34:51+00:00","remoteAddr":"192.168.2.31","user":"Evoluzione","app":"index","method":"POST","url":"/apps/memories/api/image/multipreview","scriptName":"/index.php","message":"Class \"OC\\Preview\\Storage\\Root\" not found","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0","version":"33.0.0.16","exception":{"Exception":"Error","Message":"Class \"OC\\Preview\\Storage\\Root\" not found","Code":0,"Trace":[{"file":"/config/www/nextcloud/apps/memories/lib/UtilController.php","line":53,"function":"{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}","class":"OCA\\Memories\\Controller\\ImageController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/app/www/public/lib/private/AppFramework/App.php","line":210,"function":"callback","class":"OCP\\AppFramework\\Http\\Response@anonymous\u0000/config/www/nextcloud/apps/memories/lib/UtilController.php:41$95","type":"->"},{"file":"/app/www/public/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/app/www/public/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/app/www/public/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/config/www/nextcloud/apps/memories/lib/Controller/ImageController.php","Line":120,"message":"Class \"OC\\Preview\\Storage\\Root\" not found","exception":"{\"class\":\"Error\",\"message\":\"Class \\\"OC\\Preview\\Storage\\Root\\\" not found\",\"code\":0,\"file\":\"/config/www/nextcloud/apps/memories/lib/Controller/ImageController.php:120\",\"trace\":\"#0 /config/www/nextcloud/apps/memories/lib/UtilController.php(53): OCA\\Memories\\Controller\\ImageController->{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}()\\n#1 /app/www/public/lib/private/AppFramework/App.php(210): OCP\\AppFramework\\Http\\Response@anonymous->callback()\\n#2 /app/www/public/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#3 /app/www/public/lib/base.php(1155): OC\\Route\\Router->match()\\n#4 /app/www/public/index.php(25): OC::handleRequest()\\n#5 {main}\"}","CustomMessage":"Class \"OC\\Preview\\Storage\\Root\" not found"},"id":"69985550e9c78"}

Other logs :

2026/02/20 13:35:51 [error] 382#382: *358 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/3203753?c=99d6bc804e18a3fda8e1a6621cfd61ee&x=340&y=340&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *359 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/2867559?c=560d9220de68ec9647226fc0f9269dda&x=683&y=683&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *360 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/2211864?c=756b0f0a61658cb06bb3f4c4ea122d50&x=681&y=681&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *361 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/1718768?c=c9b5219796c64407468b8d2a30ab54ef&x=909&y=909&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *362 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/428576?c=fb9435a12f2686d1d6ab5cc9d715115e&x=909&y=909&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"

[AndyXheli]

It may be because the whole new previews table base and when I was looking at the db it was trying to read from old table Oc filecache and while that was happening migrating previews from filecache to previews table I think turn off the app since it's not supported on 33 and wait till support is enabled I already create an request for that

[EVOTk]

Hello,
I solved my problem by deleting all my previews and cleaning my database. Memories is working almost correctly (I'm having trouble with the faces again)

I made a note about it ( in French ) : https://www.forum-nas.fr/threads/m%C3%A9mo-nettoyer-toutes-traces-des-pr%C3%A9visualisations-dans-nextcloud.26441/

[jph76]

Same error. Errors in logs upon opening Memories:

{"reqId":"GRYx45OYOLJQEhLB08oh","level":3,"time":"2026-02-23T18:31:45+00:00","remoteAddr":"90.153.119.68","user":"jan","app":"index","method":"POST","url":"/apps/memories/api/image/multipreview","scriptName":"/index.php","message":"Class \"OC\\Preview\\Storage\\Root\" not found","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0","version":"33.0.0.16","exception":{"Exception":"Error","Message":"Class \"OC\\Preview\\Storage\\Root\" not found","Code":0,"Trace":[{"file":"/var/www/nextcloud/apps/memories/lib/UtilController.php","line":53,"function":"{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}","class":"OCA\\Memories\\Controller\\ImageController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/lib/private/AppFramework/App.php","line":210,"function":"callback","class":"OCP\\AppFramework\\Http\\Response@anonymous\u0000/var/www/nextcloud/apps/memories/lib/UtilController.php:41$1b7","type":"->"},{"file":"/var/www/nextcloud/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/var/www/nextcloud/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/var/www/nextcloud/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/var/www/nextcloud/apps/memories/lib/Controller/ImageController.php","Line":120,"message":"Class \"OC\\Preview\\Storage\\Root\" not found","exception":"{\"class\":\"Error\",\"message\":\"Class \\\"OC\\Preview\\Storage\\Root\\\" not found\",\"code\":0,\"file\":\"/var/www/nextcloud/apps/memories/lib/Controller/ImageController.php:120\",\"trace\":\"#0 /var/www/nextcloud/apps/memories/lib/UtilController.php(53): OCA\\Memories\\Controller\\ImageController->{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}()\\n#1 /var/www/nextcloud/lib/private/AppFramework/App.php(210): OCP\\AppFramework\\Http\\Response@anonymous->callback()\\n#2 /var/www/nextcloud/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#3 /var/www/nextcloud/lib/base.php(1155): OC\\Route\\Router->match()\\n#4 /var/www/nextcloud/index.php(25): OC::handleRequest()\\n#5 {main}\"}","CustomMessage":"Class \"OC\\Preview\\Storage\\Root\" not found"},"id":"699c9d1d5ad03"}

{"reqId":"dDHRtQL8TIf4WOrF83bx","level":3,"time":"2026-02-23T18:31:46+00:00","remoteAddr":"90.153.119.68","user":"jan","app":"no app in context","method":"GET","url":"/apps/memories/api/image/preview/7903818?c=676165fa3d96cac251542ce5596583a8&x=340&y=340&a=1","scriptName":"/index.php","message":"Unable to open preview stream at /var/www/nextcloud/data/appdata_oc1n7wn21i8i/preview/f/1/6/8/0/d/2/7903818/341-256.jpg","userAgent":"Mozilla/5.0 (X11; Linux x86_64; rv:140.0) Gecko/20100101 Firefox/140.0","version":"33.0.0.16","data":{"trace":"[{\"file\":\"/var/www/nextcloud/lib/private/Preview/Storage/StorageFactory.php\",\"line\":34,\"function\":\"readPreview\",\"class\":\"OC\\Preview\\Storage\\LocalPreviewStorage\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/lib/private/Preview/Storage/PreviewFile.php\",\"line\":48,\"function\":\"readPreview\",\"class\":\"OC\\Preview\\Storage\\StorageFactory\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/apps/memories/lib/Controller/ImageController.php\",\"line\":84,\"function\":\"getContent\",\"class\":\"OC\\Preview\\Storage\\PreviewFile\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/apps/memories/lib/UtilController.php\",\"line\":20,\"function\":\"{closure:OCA\\Memories\\Controller\\ImageController::preview():55}\",\"class\":\"OCA\\Memories\\Controller\\ImageController\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/apps/memories/lib/Controller/ImageController.php\",\"line\":55,\"function\":\"guardEx\",\"class\":\"OCA\\Memories\\Util\",\"type\":\"::\"},{\"file\":\"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php\",\"line\":205,\"function\":\"preview\",\"class\":\"OCA\\Memories\\Controller\\ImageController\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/lib/private/AppFramework/Http/Dispatcher.php\",\"line\":118,\"function\":\"executeController\",\"class\":\"OC\\AppFramework\\Http\\Dispatcher\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/lib/private/AppFramework/App.php\",\"line\":153,\"function\":\"dispatch\",\"class\":\"OC\\AppFramework\\Http\\Dispatcher\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/lib/private/Route/Router.php\",\"line\":321,\"function\":\"main\",\"class\":\"OC\\AppFramework\\App\",\"type\":\"::\"},{\"file\":\"/var/www/nextcloud/lib/base.php\",\"line\":1155,\"function\":\"match\",\"class\":\"OC\\Route\\Router\",\"type\":\"->\"},{\"file\":\"/var/www/nextcloud/index.php\",\"line\":25,\"function\":\"handleRequest\",\"class\":\"OC\",\"type\":\"::\"}]"},"id":"699c9d1d5acd9"}

[Tlpub]

Hello, I solved my problem by deleting all my previews and cleaning my database. Memories is working almost correctly (I'm having trouble with the faces again)

I made a note about it ( in French ) : https://www.forum-nas.fr/threads/m%C3%A9mo-nettoyer-toutes-traces-des-pr%C3%A9visualisations-dans-nextcloud.26441/

Bonjour !
Thank you for the link, I applied it and it has fixed the "preview" storage locations by getting rid of oc_filecache table.

But I continue getting "Class OC\Preview\Storage\Root not found" errors when navigating in Memories 7.8.2

Here is a curated sample of logs

{
  "app": "index",
  "method": "POST",
  "url": "/apps/memories/api/image/multipreview",
  "scriptName": "/index.php",
  "message": "Class \"OC\\Preview\\Storage\\Root\" not found",
  "version": "33.0.0.16",
  "exception": {
    "Exception": "Error",
    "Message": "Class \"OC\\Preview\\Storage\\Root\" not found",
    "Trace": [
      {
        "file": "/config/www/nextcloud/apps/memories/lib/UtilController.php",
        "line": 53,
        "function": "{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}",
        "class": "OCA\\Memories\\Controller\\ImageController",
      }
}

I see no other issues than this log "flooding", and it does not seem to impact user experience (no Nextcloud crash observed yet).

Regards

[EVOTk]

Thank you for the link, I applied it and it has fixed the "preview" storage locations by getting rid of oc_filecache table.

But I continue getting "Class OC\Preview\Storage\Root not found" errors when navigating in Memories 7.8.2

Yes, my link is related to this :

Nextcloud crash after accessing to Memories.

In logs i'm have :

{"reqId":"kWn6O8YVgcSSOyUg3TVH","level":3,"time":"2026-02-20T12:34:51+00:00","remoteAddr":"192.168.2.31","user":"Evoluzione","app":"index","method":"POST","url":"/apps/memories/api/image/multipreview","scriptName":"/index.php","message":"Class \"OC\\Preview\\Storage\\Root\" not found","userAgent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:147.0) Gecko/20100101 Firefox/147.0","version":"33.0.0.16","exception":{"Exception":"Error","Message":"Class \"OC\\Preview\\Storage\\Root\" not found","Code":0,"Trace":[{"file":"/config/www/nextcloud/apps/memories/lib/UtilController.php","line":53,"function":"{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}","class":"OCA\\Memories\\Controller\\ImageController","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/app/www/public/lib/private/AppFramework/App.php","line":210,"function":"callback","class":"OCP\\AppFramework\\Http\\Response@anonymous\u0000/config/www/nextcloud/apps/memories/lib/UtilController.php:41$95","type":"->"},{"file":"/app/www/public/lib/private/Route/Router.php","line":321,"function":"main","class":"OC\\AppFramework\\App","type":"::"},{"file":"/app/www/public/lib/base.php","line":1155,"function":"match","class":"OC\\Route\\Router","type":"->"},{"file":"/app/www/public/index.php","line":25,"function":"handleRequest","class":"OC","type":"::"}],"File":"/config/www/nextcloud/apps/memories/lib/Controller/ImageController.php","Line":120,"message":"Class \"OC\\Preview\\Storage\\Root\" not found","exception":"{\"class\":\"Error\",\"message\":\"Class \\\"OC\\Preview\\Storage\\Root\\\" not found\",\"code\":0,\"file\":\"/config/www/nextcloud/apps/memories/lib/Controller/ImageController.php:120\",\"trace\":\"#0 /config/www/nextcloud/apps/memories/lib/UtilController.php(53): OCA\\Memories\\Controller\\ImageController->{closure:OCA\\Memories\\Controller\\ImageController::multipreview():99}()\\n#1 /app/www/public/lib/private/AppFramework/App.php(210): OCP\\AppFramework\\Http\\Response@anonymous->callback()\\n#2 /app/www/public/lib/private/Route/Router.php(321): OC\\AppFramework\\App::main()\\n#3 /app/www/public/lib/base.php(1155): OC\\Route\\Router->match()\\n#4 /app/www/public/index.php(25): OC::handleRequest()\\n#5 {main}\"}","CustomMessage":"Class \"OC\\Preview\\Storage\\Root\" not found"},"id":"69985550e9c78"}

Other logs :

2026/02/20 13:35:51 [error] 382#382: *358 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/3203753?c=99d6bc804e18a3fda8e1a6621cfd61ee&x=340&y=340&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *359 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/2867559?c=560d9220de68ec9647226fc0f9269dda&x=683&y=683&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *360 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/2211864?c=756b0f0a61658cb06bb3f4c4ea122d50&x=681&y=681&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *361 upstream timed out (110: Operation timed out) while reading response header from upstream, client: 192.168.2.41, server: _, request: "GET /apps/memories/api/image/preview/1718768?c=c9b5219796c64407468b8d2a30ab54ef&x=909&y=909&a=1 HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "cloud.ndd.fr", referrer: "https://cloud.ndd.fr/apps/memories/js/memories-components_frame_XImgWorkerStub_ts.js?v=22e85dde849634c502a9"
2026/02/20 13:35:51 [error] 382#382: *362 upstream timed out (110: Operation timed out) while reading response header from u

Class "OC\Preview\Storage\Root" not found error is another problem that doesn't prevent Memories from working properly.