Question:

An error occurs in the activity log: Reason = keypath <field_name__c> not found in entity <NSSQLEntity <Object_name__c> id=1>.  What is the meaning of this error?

Answer:

The error means that the user does not have Field Level Security (FLS) access to the field that is displayed in field_name__c on the object which is displayed in Object_name__c.

Related Documentation:

CRM Help Documentation: N/A