Error while Compiling "freertos/FreeRTOS.h: No such file or directory"

[thalie-lux]

My Error Message:

In file included from c:\Users\xxxx\Documents\Arduino\libraries\esp_dmx\src/dmx/include/device.h:10,
from c:\Users\xxxx\Documents\Arduino\libraries\esp_dmx\src/esp_dmx.h:10,
from C:\Users\xxxx\Documents\Arduino\Projects\ESP8266_DMX_Receiver_1\ESP8266_DMX_Receiver_1.ino:4:
c:\Users\xxxx\Documents\Arduino\libraries\esp_dmx\src/dmx/include/types.h:9:10: fatal error: freertos/FreeRTOS.h: No such file or directory
9 | #include "freertos/FreeRTOS.h"
| ^~~~~~~~~~~~~~~~~~~~~
compilation terminated.
exit status 1

Compilation error: exit status 1