RQM and RRC v3.0.1.1 on WASND 7.0.0.27 to RQM/RRC 4.0.1 issues

I tried to upgrade a server having RQM and RRC v 3.0.1.1 on WASND 7.0.0.27 to RQM/RRC v4.0.1. But while performing online migration for RRC. I get the error as shown in the attachment.

This was not able to resolve by the support team as well. The PMR is lying for more than 2 weeks and they keep saying upgrade again. Every time I do the same error persists.

Interesting point is when I dropped my DW database and recreated while performing the upgrade it worked and upgrade was successful. But I cannot drop DW database as it contains report data,etc, I have the DW path configured manually.

Meanwhile I resovled the issue by using WASND 8.0.0.3 and continued to perform the RRC online migration step which worked successfully without dropping and recreating DW database and completed the migration.

This indicated there is some issue while using WASND 7.0.0.27 or WASND 7.0.0.23 (I tried 7.0.0.23) as well....

Hope this helps anyone who got struck like us.