I run cuckoo,but it stopped,display like this: ''' 2021-12-09 18:50:38,135 [cuckoo.core.scheduler] INFO: Using "virtualbox" as machine manager Oops! Cuckoo failed in an unhandled exception! Sometimes bugs are already fixed in the development release, it is therefore recommended to retry with the latest development release available https://github.com/cuckoosandbox/cuckoo If the error persists please open a new issue at https://github.com/cuckoosandbox/cuckoo/issues
=== Exception details ===
Cuckoo version: 2.0.7
OS version: posix
OS release: Ubuntu 16.04 xenial
Python version: 2.7.12
Python implementation: CPython
Machine arch: i686
Modules: adium-theme-ubuntu:0.3.4 alembic:1.0.10 androguard:3.0.1 argparse:1.2.1 asn1crypto:1.4.0 attrs:21.2.0 beautifulsoup4:4.5.3 bottle:0.12.7 capstone:3.0.5rc2 cffi:1.15.0 chardet:2.3.0 click:6.6 colorama:0.3.7 configparser:4.0.2 contextlib2:0.6.0.post1 cryptography:2.2.1 cuckoo:2.0.7 distorm3:3.5.2 django-extensions:1.6.7 django:1.8.4 dpkt:1.8.7 dumbnet:1.12 ecdsa:0.17.0 egghatch:0.2.3 elasticsearch:5.3.0 enum34:1.1.10 et-xmlfile:1.1.0 flask-sqlalchemy:2.4.0 flask:0.12.2 functools32:3.2.3.post2 future:0.18.2 gevent:1.2.2 greenlet:1.1.2 httpreplay:0.2.6 idna:2.10 importlib-metadata:2.1.2 ipaddress:1.0.23 itsdangerous:1.1.0 jdcal:1.4.1 jinja2:2.9.6 jsbeautifier:1.6.2 jsonschema:4.0.0 libvirt-python:1.3.1 magic-file-extensions:0.2 mako:1.1.6 markupsafe:0.23 olefile:0.43 oletools:0.51 openpyxl:2.2.5 pathlib2:2.3.6 peepdf:0.4.2 pefile2:1.2.11 pefile:1.2.10.post139 pillow:3.2.0 pip:20.3.4 pyasn1:0.4.8 pycparser:2.21 pycrypto:2.6.1 pycurl:7.43.0 pyelftools:0.24 pyguacamole:0.6 pyliblzma:0.5.3 pymisp:2.4.106 pymongo:3.0.3 pyopenssl:18.0.0 pyrsistent:0.16.1 pysqlite:1.0.1 python-dateutil:2.4.2 python-editor:1.0.4 python-magic:0.4.12 python:2.7.12 pythonaes:1.0 pytz:2014.10 requests:2.13.0 roach:0.1.2 rpm-python:4.12.0.1 scandir:1.10.0 scapy:2.3.2 setuptools:20.7.0 sflock:0.3.10 six:1.16.0 sqlalchemy:1.3.3 sqlparse:0.1.18 tlslite-ng:0.6.0 ujson:2.0.3 unicorn:1.0.1 unity-lens-photos:1.0 urlgrabber:3.9.1 urllib3:1.26.7 vboxapi:1.0 volatility:2.6.1 wakeonlan:0.2.2 werkzeug:1.0.1 wheel:0.37.0 wsgiref:0.1.2 yara-python:3.6.3 yum-metadata-parser:1.1.4 zipp:1.2.0
2021-12-09 18:50:38,141 [cuckoo] ERROR: AttributeError: 'NoneType' object has no attribute 'shutdown'
Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/cuckoo/main.py", line 298, in main
cuckoo_main(maxcount)
File "/usr/local/lib/python2.7/dist-packages/cuckoo/main.py", line 248, in cuckoo_main
stop()
File "/usr/local/lib/python2.7/dist-packages/cuckoo/main.py", line 231, in stop
sched.stop()
File "/usr/local/lib/python2.7/dist-packages/cuckoo/core/scheduler.py", line 945, in stop
machinery.shutdown()
AttributeError: 'NoneType' object has no attribute 'shutdown'
'''