cuckoo is not working，Your help is much appreciated.

[fjycomes]

When I run cuckoo it shows CuckooOperationalError, the full error is reported as:
Traceback (most recent call last):
File "/usr/local/bin/cuckoo", line 5, in
from cuckoo.main import main
File "/usr/local/lib/python2.7/dist-packages/cuckoo/init.py", line 6, in
from cuckoo import (
File "/usr/local/lib/python2.7/dist-packages/cuckoo/processing/init.py", line 10, in
file, "cuckoo.processing", globals(), Processing
File "/usr/local/lib/python2.7/dist-packages/cuckoo/core/plugins.py", line 46, in enumerate_plugins
"review its contents and/or validity!" % (module_name, e)
cuckoo.common.exceptions.CuckooOperationalError: Unable to load the Cuckoo plugin at cuckoo.processing.procmemory: cannot import name XOR. Please review its contents and/or validity!

Your help is much appreciated.