Whenever I save a page, story, or product the following two warning messages are generated:

Missing argument 2 for variable_get(), called in /home/ww7ba/bridgerfur.com/sites/all/modules/autotagging/autotagging.module on line 63 and defined in /home/ww7ba/bridgerfur.com/includes/bootstrap.inc on line 502.

preg_replace() [<a href='function.preg-replace'>function.preg-replace</a>]: Empty regular expression in /home/ww7ba/bridgerfur.com/sites/all/modules/autotagging/autotagging.module on line 63.

The message is not conditional on the tagging service used.