Error in tool_offsetview.py

    def dialog_return(self, w, message):         rtn = message.get('RETURN')         name = message.get('NAME')         plate_code = bool(message.get('ID') == '_touchplate_')         sensor_code = bool(message.get('ID') == '_toolsensor_')         wait_code = bool(message.get('ID') == '_wait_resume_')         lower_code = bool(message.get('ID') == '_wait_to_lower_')         unhome_code = bool(message.get('ID') == '_unhome_')         overwrite = bool(message.get('ID') == '_overwrite_')         if plate_code and name == 'MESSAGE' and rtn is True:             self.touchoff('touchplate')         elif sensor_code and name == 'MESSAGE' and rtn is True:             self.touchoff('sensor')         elif wait_code and name == 'MESSAGE':             self.lowerSpindle()         elif unhome_code and name == 'MESSAGE' and rtn is True:             ACTION.SET_MACHINE_UNHOMED(-1)         elif overwrite and name == 'MESSAGE':             if rtn is True:                 self.do_file_copy()             else:                 self.add_status(_translate("HandlerClass","File not copied"), CRITICAL)         elif lower_code and name == 'MESSAGE':             self.h['eoffset-spindle-count'] = 0             self.h['spindle-inhibit'] = False # add this line <------             self.add_status(_translate("HandlerClass",'Spindle lowered after machine stopped'))