I did an in-place upgrade fc11r3 to r6.
When I try to open the admin and monitoring tool, the only page opens is the page asking to update the flexicapture database version 72 to version 75.
When I click upgrade, I get the error attached in the screenshot and if I try to create a new database, i get the message saying 'close existing sessions before creating new database'.
I know how to close the sessions from the Monitoring->sessions menu, But when I click that, nothing happens, I get back to the same page asking for database upgrade.
What can i do in this case to solve this issue?