Overview:
An end-user is unable to open a Call Report in Online CRM due to any of the following error:
In the browser Developer Console, the following error appears:
Root Cause:
The user lost access to the Account against which the Parent Call or any of the Child Calls is recorded. This is due to a change in Territory assignment or Sharing Rules.
Solution:
Grant the user access to the Account that is previously revoked.
Related Documentation:
CRM Help Documentation: N/A