error: Unprocessable Entity

[mujinlu]

I have configured all the settings as the instructions. But when I submit the booking form, there is an error: Unprocessable Entity. By the way, I install the Redmine with docker. Do I still need to run the "rake redmine:plugins:migrate "? Thanks

Request URL: http://XXXXXX:3000/meeting_room_calendar/create?key=5a273b023b6d2377c4014468ed19d41555be0161&project_id=3&author_id=1&assigned_to_id=1&category_id=0&subject=Redmine+Admin&start_date=2018-06-09&due_date=2018-06-09&custom_field_values%5B1%5D=Room+1111&custom_field_values%5B2%5D=09%3A00&custom_field_values%5B3%5D=09%3A15&event_id=0&recur=false&periodtype=1&period=5
Request Method: GET
Status Code: 422 Unprocessable Entity

Environment:
Redmine version 3.4.4.stable
Ruby version 2.3.5-p376 (2017-09-14) [x86_64-linux-gnu]
Rails version 4.2.8
Environment production
Database adapter PostgreSQL
SCM:
Subversion 1.8.8
Darcs 2.8.4
Mercurial 2.8.2
Cvs 1.12.13
Bazaar 2.7.0
Git 2.15.1
Filesystem
Redmine plugins:
redmine_meeting_room_calendar 3.0.0

[ghost]

Hi,
I am having the same issue.
I was wondering if you ever managed to fix it?
If so, how?