Errors while packaging from command line

[minotogna]

When i execute 'mvn package' from command line there are tests that fail:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.12.4:test (default-test) on project jwebclient-analyzer: There are test failures.
[ERROR]
[ERROR] Please refer to C:\redd\portal\jwebclient-analyzer\target\surefire-reports for the individual test results.
[ERROR] -> [Help 1]

When i execute 'mvn package -DskipTests=true' from command line to skip the tests, I got a different error:
[ERROR] Failed to execute goal com.github.bringking:requirejs-maven-plugin:2.0.4:optimize (default) on project demo: r.js exited with an error. -> [Help 1]

Is there anyone who can help to understand what's the problem?
Thank you!
Mino