error message "Could not load workbench panels" Splunk ES - Content Management about security_content HOT 3 CLOSED

10-12-2020 09:44:14.008 -0400 ERROR AdminManagerExternal - Stack trace from python handler:
Traceback (most recent call last):
  File "/opt/splunk/lib/python2.7/site-packages/splunk/admin.py", line 94, in init_persistent
    hand.execute(info)
  File "/opt/splunk/lib/python2.7/site-packages/splunk/admin.py", line 595, in execute
    if self.requestedAction == ACTION_LIST:     self.handleList(confInfo)
  File "/opt/splunk/etc/apps/SA-Utils/lib/SolnCommon/rest_handler.py", line 316, in wrapper
    r = f(self, *args, **kwargs)
  File "/opt/splunk/etc/apps/SplunkEnterpriseSecuritySuite/bin/es_investigations_rest_handler.py", line 217, in handleList
    stanza_name, stanza_attributes, klass))
  File "/opt/splunk/etc/apps/SplunkEnterpriseSecuritySuite/bin/es_investigations_rest_handler.py", line 478, in get_panels_from_stanza
    panel_list = json.loads(stanza_attributes.get('panels', '[]'))
  File "/opt/splunk/lib/python2.7/json/__init__.py", line 339, in loads
    return _default_decoder.decode(s)
  File "/opt/splunk/lib/python2.7/json/decoder.py", line 364, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
TypeError: expected string or buffer

10-12-2020 09:44:14.008 -0400 ERROR AdminManagerExternal - Unexpected error "<type 'exceptions.TypeError'>" from python handler: "expected string or buffer".  See splunkd.log for more details.