I couldn't get the java file to launch iPHUC, so I moved the entire jailbreak ZIP file to my ROOT DRIVE (C:\) and re-ran the java file right from C: (also there is iPHUC.exe). It worked this time, whereas before it was in a folder (and didn't work). So if you're having trouble and getting these "unrecoverable error" messages, or iPHUC errors, copy everything to C:\ and try again.