Actually I solved this problem now, but i think this is worth to record, so I open this issue, then I will close it by myself.
the reason caused this problem is ordering between sys.path insertion and from settings import * in settings_appengine.py
because we will use things from mezzanine in settings, so we better insert lib path into sys.path before we run from settings import *, or in settings runtime will find nothing and raise the exception not finding out mezzanine.
Actually I solved this problem now, but i think this is worth to record, so I open this issue, then I will close it by myself.
the reason caused this problem is ordering between sys.path insertion and
from settings import *
in settings_appengine.pybecause we will use things from mezzanine in settings, so we better insert lib path into sys.path before we run
from settings import *
, or in settings runtime will find nothing and raise the exception not finding out mezzanine.