[Rapboy]

I am getting the following error with simplecache, it used to work before, but since yesterday I am getting this error:

 

   - NOTE: IGNORING THIS CAN LEAD TO MEMORY LEAKS!
                                            Error Type: <type 'exceptions.NameError'>

                                            Error Contents: name 'new_datetime' is not defined

                                            Traceback (most recent call last):
                                              File "/home/purpz/.kodi/addons/plugin.video.sortzy/main.py", line 315, in <module>
                                                router(sys.argv[2][1:])
                                              File "/home/purpz/.kodi/addons/plugin.video.sortzy/main.py", line 295, in router
                                                mylink(params['contr'])
                                              File "/home/purpz/.kodi/addons/plugin.video.sortzy/main.py", line 153, in mylink
                                                cache_setter('sortzy.myshows', mylink.shows(), 2)
                                              File "/home/purpz/.kodi/addons/plugin.video.sortzy/main.py", line 211, in cache_setter
                                                _cache = simplecache.SimpleCache()
                                              File "/home/purpz/.kodi/addons/script.module.simplecache/lib/simplecache.py", line 33, in __init__
                                                self.check_cleanup()
                                              File "/home/purpz/.kodi/addons/script.module.simplecache/lib/simplecache.py", line 96, in check_cleanup
                                                elif (eval(lastexecuted) + self._auto_clean_interval) < cur_time:
                                              File "<string>", line 1, in <module>
                                            NameError: name 'new_datetime' is not defined
                                            -->End of Python script error report<--

What I do not understand is, I have not defined 'new_datetime' because it's not in my addon, and I can not find it in simplecache.py. Anyone has any clue what might be going on? Maybe an issue with the time I am passing from my addon? Or does anyone know an alternative that is easy and quick to store either function or data for a short time frame (+-2 hours)