I need help with installing the ReProccer for SkyRe.

I have downloaded SkyRe, I have the java run time environment and the most up to date version of SKSE.

I have installed SkyRe and the ReProccer I go to run the ReProccer.jar and click patch and half way through the patching process an error comes up.

There was an error exporting the custom patch.

(null)

Anyone able to help?