celeryworker failed to build

[cyrano007]

Building celeryworker Step 1/24 : FROM python:3.6-alpine3.6 as BUILDER ERROR: Service 'celeryworker' failed to build: Error parsing reference: "python:3.6-alpine3.6 as BUILDER" is not a valid repository/tag: invalid reference format

[douglasmiranda]

What version of Docker are you using?

(Place the output of docker version command.)