Here is a 'funny' error in the validator. It says:
This feed does not validate.
* Your feed appears to be encoded as 'US-ASCII', but
your server is reporting 'US-ASCII'
Which gives this error too:
* line 324, column 342: 'ascii' codec can't decode byte
0x91 in position 19659: ordinal not in range(128)
(maybe a high-bit character?)