2019-03-06 10:19:19,131 [ttp-apr-8080-exec-31] [TABTHREAD5] [ ] [ GRPKessai:01.01.01] (Validate.Rule_Obj_Class.Action) ERROR santen- - Problem validating class Santen-FW-Base-Data-MyDivisionApplication java.lang.NullPointerException
But in the tracer log noticed that the Rule-Obj-Class.PreSave activity step 1 is failing to find an instance using Obj-Open-By-Handle with pzInsKey = RULE-OBJ-CLASS SANTEN-FW-BASE-DATA-MYDIVISIONAPPLICATION with the below error in line 119,
Unable to open an instance using the given inputs: RULE-OBJ-CLASS SANTEN-FW-BASE-DATA-MYDIVISIONAPPLICATION
The activity unable to open the Class record with the above pzInsKey and we don't have sufficient information regarding its failure to find the record in database. So probably you can try to enable the DB Query and DB Cache in your tracer settings to see why the system not able to open this record.
Hope this might help you to proceed further with your investigation.