Cause
An attempt was made to get the bytes for countersignature for a row that was not countersigned yet.
Action
Countersign the row and retry.
Oracle 26ai
ORA-05827
Error Message
Countersignature does not exist for row at pluggable database GUID 'string', instance ID 'string', chain ID 'string', sequence number 'string' in table 'string'.'string'.