مشکل IBS Core در IBSng

سلام.

موقعی که میخوام یوزد ادد کنم یا شارژ اضافه کنم این اررور میده بهم .

Internal Error, Can't connect to IBS Core (HTTP/1.0 500 Internal Server Error) 

فایل ibs_error.log :

Traceback (most recent call last):
  File "/usr/local/IBSng/core/server/xmlrpcserver.py", line 53, in do_POST
    response = xmlrpclib.dumps(response, methodresponse=1)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 1086, in dumps
    data = m.dumps(params)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 633, in dumps
    dump(v, write)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 655, in __dump
    f(self, value, write)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 715, in dump_array
    dump(v, write)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 655, in __dump
    f(self, value, write)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 736, in dump_struct
    dump(v, write)
  File "/usr/lib64/python2.7/xmlrpclib.py", line 647, in __dump
    raise TypeError, "cannot marshal %s objects" % type(value)
TypeError: cannot marshal <class 'decimal.Decimal'> objects