Exception Error in SQL Check Version 3.6

Suddenly SQL check stopped working and not able to monitor several of our main Database servers, and it throws an error as shown below.

Can you help us in getting it resolved as we depends a lot on that tool to monitor the databases.

what we did to try troublehsoot:

  1. Installed v3.6 to other client and error still persist against the old monitored SQL Servers.
  2. Checked other SQL server which newly added and it doesn’t show the error and it works fine.

So the issue with the previous being monitored SQL servers.