For some reason, the uc_pnag.inc is not loaded when the hook_payment_method() in uc_pnag.inc is called and that results in a undefined function call error. Not sure why that's the case and I raised the question in the module development forum (http://drupal.org/node/534558).
Comments
Comment #1
jurgenhaasSolved by going the long way: using include_once really everywhere for safety.