Application won't compile in heroku

[DiogoTavaresDeAlmeidaRibeiro]

Hi,

I have an app that stopped to compile in Heroku. No error is provided. By disabling DISABLE_DEPENDENCY_CLASSPATH_LOG it works but I would like to understand what's happening.

remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Building on the Heroku-18 stack
remote: -----> Deleting 4 files matching .slugignore patterns.
remote: -----> Using buildpack: heroku/scala
remote: -----> Play 2.x - Java app detected
remote: -----> Installing OpenJDK 1.7... done
remote: -----> Running: sbt compile stage
remote:        [info] Loading global plugins from /tmp/scala_buildpack_build_dir/.sbt_home/plugins
remote:        [info] Compiling 1 Scala source to /tmp/scala_buildpack_build_dir/.sbt_home/plugins/target/scala-2.9.1/sbt-0.11.3/classes...
remote:        [info] Loading project definition from /tmp/scala_buildpack_build_dir/project
remote:        [info] Set current project to <PROJECT_NAME> (in build file:/tmp/scala_buildpack_build_dir/)
remote:        [info] Compiling 160 Scala sources and 7 Java sources to /tmp/scala_buildpack_build_dir/target/scala-2.9.1/classes...
remote:        [info] Compiling 151 Scala sources and 124 Java sources to /tmp/scala_buildpack_build_dir/target/scala-2.9.1/classes...
remote:        [success] Total time: 67 s, completed Oct 25, 2022 9:11:48 AM
remote:        [info] Packaging /tmp/scala_buildpack_build_dir/target/scala-2.9.1/<PROJECT_NAME>_2.9.1-1.0-SNAPSHOT.jar ...
remote:        [info] Done packaging.
remote:        [info]
remote:        [info] Your application is ready to be run in place: target/start
remote:        [info]
remote:        [success] Total time: 2 s, completed Oct 25, 2022 9:11:50 AM
remote: -----> Collecting dependency information
remote:  !     Push rejected, failed to compile Play 2.x - Java app.
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to <PROJECT_NAME>.
remote:

Thanks,
Diogo