GNU Emacs 23.2.1 (x86_64-apple-darwin10.4.0, NS apple-appkit-1038.32) of
2010-08-27 on ishida-souichi-no-MacBook.local

I get an error,

Wrong type argument: characterp, sgml-xml-mode

when implementing org-googlecl.el <https://github.com/rileyrg/org-googlecl> .
 It seems like this particular is not the cause of the error above.
How can I trace the cause of errors?

If anyone has a resolution to it, I would appreciate it.


Regards,

soichi