Hi Arghya!
I'm sending here the same update which I've sent to you in the other thread.
I'm afraid that the trace messages which you are mentioning are not related to the actual problem that you're having in the worklist.
I would advise you to use the portal Log Watch tool according to the following KBA:
1593107 - Logwatch Tool - Collecting Portal DefaultTrace logs
You should select com.sap.netweaver.bc.uwl as the trace location to be recored and ALL as the trace severity. After hitting Record then recreate the issue, checking the logs afterwards.
You should see an error from UWL, when connecting to one or more of the connectors which you have defined.
Keep us posted on the outcome.
Regards,
Armando Zaro