The server task that host Topology UI is failed to start with U4038 abend.
15.09.00 STC11253 IEF450I APISTC STARTAPI APISTC - ABEND=S000 U4038 REASON=00000001 682
682 TIME=15.09.00
15.09.00 STC11253 IEF404I APISTC - ENDED - TIME=15.09.00
15.09.00 STC11253 $HASP395 APISTC ENDED - ABEND=U4038
Topology
Extractor Aggregator job wasn't finished
The extractor aggregator job should be finished prior to starting API STC because that job will create topology.db file that is proceed by API STC.