code: def _load_activity(self, activity):
          
          fpths = []
          full_path = ''
          errors = []
          paths = settings.ACTIVITY_MODULES_IMPORT_PATHS
          number_of_paths = len(paths)
          for index_no in range(number_of_paths):
              full_path = "%s.%s" % (paths[index_no], activity)
              for look4kls in (0, 1):
                  try:
                      self.current.log.info("try to load from %s[%s]" % (full_path, look4kls))
                      kls, cls_name, cls_method = self._import_object(full_path, look4kls)
                      if cls_method:
                          self.current.log.info("WILLCall %s(current).%s()" % (kls, cls_method))
                          self.wf_activities[activity] = lambda crnt: getattr(kls(crnt), cls_method)()
                      else:
                          self.wf_activities[activity] = kls
                      return
                  except (ImportError, AttributeError):
                      fpths.append(full_path)
                      errmsg = "{activity} not found under these paths:\n\n >>> {paths} \n\n" \
                               "Error Messages:\n {errors}"
                      errors.append("\n========================================================>\n"
                                    "| PATH | %s"
                                    "\n========================================================>\n\n"
                                    "%s" % (full_path, traceback.format_exc()))
                      assert index_no != number_of_paths - 1, errmsg.format(activity=activity,
                                                                            paths='\n >>> '.join(
                                                                                set(fpths)),
                                                                            errors='\n\n'.join(errors)
                                                                            )
                  except:
                      self.current.log.exception("Cannot found the %s" % activity)
docs: Iterates trough the all enabled `~zengine.settings.ACTIVITY_MODULES_IMPORT_PATHS` to find the given path.