You probably have some broken rules or other lines in your local rules file, or possibly elsewhere in the rules files. To catch thos you want to run "spamassassin --lint" without the debug stuff. This will give you a managable output.
Assuming you are on NT of some flavor, "spamassassin <stuff> 2>&1 >outfile.txt" should catch the stderror output as well as the stdout output. "<stuff>" is obviously whatever parameters you want to give, like "-D <myspam.txt" or the like. Loren