assertion failed: Incoherence: dynverTagPrefix=v vs dynverVTagPrefix=false

[ignasi35]

Upgrading from 4.0.0 to 4.1.0 a project with the setting:

dynverVTagPrefix in ThisBuild := false

causes the project to not load with the error:

[info] loading settings for project twirl from build.sbt ...
[error] java.lang.AssertionError: assertion failed: Incoherence: dynverTagPrefix=v vs dynverVTagPrefix=false
[error] Use 'last' for the full log.
Project loading failed: (r)etry, (q)uit, (l)ast, or (i)gnore?

(see for example https://travis-ci.com/github/playframework/twirl/jobs/355362477)

The workaround is to opt out of the (old) dynverVTagPrefix and, instead, set dynverTagPrefix="". See the release notes.

[ignasi35]

Hmm, sometimes the error is not printed? (https://travis-ci.com/github/lagom/lagom/jobs/355355692#L267)

[dwijnand]

That's my bad. I really should've tested that check. Of course it's going to throw... :-/

I'll try to fix this tomorrow.

[ignasi35]

Thanks @dwijnand for the quick fix.