Job was not built successfully

I'm using Talend TIS 6.1.1 Patch 1420 with JDK 1.8.0_77.
Another issue in the midst of so many other
Whichever the project and the job, I can't build any job :
      java.lang.Exception: Job was not built successfully, please check the logs for more details available on the workspace/.Java/lastGenerated.log
at org.talend.repository.ui.wizards.exportjob.scriptsmanager.BuildJobManager.buildJob(
at org.talend.repository.ui.wizards.exportjob.scriptsmanager.BuildJobManager.buildJobs(
at org.talend.repository.ui.wizards.exportjob.JobScriptsExportWizardPage.buildJobWithMaven(
at org.talend.repository.ui.wizards.exportjob.JobScriptsExportWizardPage$
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(
--> the specified log file doesn't exit
--> Every explanation will be welcome, because it's VERY URGENT.
Twelve Stars

Re: Job was not built successfully

Job run success from Studio?
Any other error (pop-up windows and etc)?