[ERROR] Failed to execute goal com.github.eirslett:frontend-maven-plugin:1.9.1:karma (unit and integration tests) on project helmholtz-marketplace-webapp: Failed to run task: 'karma start karma.conf.js' failed. org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1) -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException Cleaning up file based variables ERROR: Job failed: exit code 1