err

aio# [   59.807472] ceph-mgr[2020]: 2019-02-26 18:38:29.704 7f28d0e47b80 -1 mgr[py] Module not found: 'dashboard'
aio# [   59.812273] ceph-mgr[2020]: 2019-02-26 18:38:29.706 7f28d0e47b80 -1 mgr[py] Traceback (most recent call last):
aio# [   59.821692] ceph-mgr[2020]:   File "/nix/store/kj6p315vpblxyca0a8213qflqm14fppc-ceph-13.2.4-lib/lib/ceph/mgr/dashboard/__init__.py", line 38, in <module>
aio# [   59.830565] ceph-mgr[2020]:     from .module import Module, StandbyModule
aio# [   59.841478] ceph-mgr[2020]:   File "/nix/store/kj6p315vpblxyca0a8213qflqm14fppc-ceph-13.2.4-lib/lib/ceph/mgr/dashboard/module.py", line 36, in <module>
aio# [   59.853982] ceph-mgr[2020]:     v = StrictVersion(cherrypy.__version__)
aio# [   59.863240] ceph-mgr[2020]:   File "/nix/store/q2370qwzyxpva75kg684r64awskrknmw-python-2.7.15-env/lib/python2.7/distutils/version.py", line 40, in __init__
aio# [   59.881502] ceph-mgr[2020]:     self.parse(vstring)
aio# [   59.889550] ceph-mgr[2020]:   File "/nix/store/q2370qwzyxpva75kg684r64awskrknmw-python-2.7.15-env/lib/python2.7/distutils/version.py", line 107, in parse
aio# [   59.908347] ceph-mgr[2020]:     raise ValueError, "invalid version number '%s'" % vstring
aio# [   59.920060] ceph-mgr[2020]: ValueError: invalid version number 'unknown'
aio# [   59.929310] ceph-mgr[2020]: 2019-02-26 18:38:29.709 7f28d0e47b80 -1 mgr[py] Class not found in module 'dashboard'
aio# [   59.941238] ceph-mgr[2020]: 2019-02-26 18:38:29.709 7f28d0e47b80 -1 mgr[py] Error loading module 'dashboard': (2) No such file or directory