xenophonf

I'm in the same boat as the original poster, in that APPDATA points to a UNC path, although the details are slightly different: I'm logged into a roaming profile with folder redirection enabled. My Documents, Pictures, AppData, etc. folders all live on a file server. Setting the Forge profile's game directory to the mapped drive doesn't fix this error, nor does wrapping the Java command with a batch file that sets the APPDATA environment variable to the mapped drive. Instead, one must override the value of APPDATA _before_ the launcher runs; otherwise, the classpath generated by the launcher for Forge's various support libraries will still refer to the UNC path, which will cause this error. The vanilla Minecraft profile works without any difficulty. P.S. I don't see where in the launcher GUI that I can specify the "--workDir" argument, but I'm guessing that I need to add it to the minecraftArguments line in "..\versions\1.6.4-Forge*\1.6.4-Forge*.json". Is that correct?