2686333 - error: timed out at 60 sec., the current owner of the lock is 'is_quiesced' - SAP Event Stream Processor

What is the meaning of the error message that the SAP Event Stream Processor project log reports, of:

Platform()::lockExternal() -- timed out at 60 sec., the current owner of the lock is 'is_quiesced'

SAP Event Stream Processor 5.1

KBA , BC-SYB-ESP , Sybase ESP (Event Stream Processor) , Problem