SAP Message WL478 - Workflow &: Repair message for error && could not be created

Diagnosis
The error &V2& &V3& occurred when the workflow &V1& was executed.
To correct the error, the system tried to send a message to theworkflow system administrator. This message could not be createdbecause the function module 'SO_OBJECT_SEND' raised the exception &V4&.
The exact cause of the error can be found in the workflow log for theprevious or subsequent error message.

System Response
The workflow was suspended and set to error status, without theresponsible administrator being informed.
INCLUDE NA_WF-ADMINISTRATOR OBJECT DOKU ID TX
Correct the error and continue the workflow (change work item and setto status In process manually).