The script is not the problem. Probably you have multiple "machines" in your 2015 Job Manager, perhaps one of them refers to the rc1 or rc2 versions? Clean up those, and make sure you run the Local machine corresponding to the version of VNL you use.
And there must be an error message, at least the job should say "failed", and you can place the mouse over the label "Failed" and get some more details (not always so many more, however).
For more help, please provide a few more details, incl. screenshots.