I’ll get someone from the support guys to help, I know they’ve come across this before. Bit of a bummer that this comes in on Friday night… In the meantime, if it’s possible, you can generate the .wbc file on another machine (Windows or Linux; Windows generally is more reliable).
You can get a license server from the 2.4.02 build (or 3.0 beta 2 if you have access). This error should be fixed there. AFAIK, it was not root related, but you must run vrlservice from the console to work around the -100 error. The new vrlservice should work fine even if launched from the GUI.