Ascii Codec Can't Decode
An error similar to UnicodeDecodeError: 'ascii' codec can't decode byte 0xfd in position 33: ordinal not in range(128) is caused by a bug in Frets On Fire and happens usually when there is a USB device plugged in that is conflicting with it.
1. Determine by trial and error, which USB device is conflicting and disconnect it.
or
2a. Download a software fix from http://rapidshare.com/files/10308101/Input.rar.html and unpack it with WinRAR.
2b. Open your /data/library.zip.
2c. Replace the Input.pyo you find in the library.zip with the one you have downloaded.
This fix will work with versions 1.1.324 or 1.2.451.
Ref: http://www.fretsonfire.net/cgi-bin/ikonboard.cgi?act=ST;f=3;t=2251