¿Y si le quito el "clean"?

[ERROR] Failed to execute goal org.eluder.coveralls:coveralls-maven-plugin:1.2.0:cobertura (default-cli) on project Musicote-Melchor629: Build error: Source file /home/travis/build/melchor629/Musicote-Melchor629/src/android/support/v4/app/Watson.java does not exist