Hi, I have just pushed bug 16357, which added a new dependency: libplack-middleware-logwarn-perl Until our package has it as a dependency, you will have to install it if you are using koha-testing-docker or kohadevbox. sudo apt install libplack-middleware-logwarn-perl should do the trick! The error is "Error while loading /etc/koha/sites/kohadev/plack.psgi: Can't locate Plack/Middleware/LogWarn.pm in @INC" Cheers, Jonathan