MySQL workbench was working properly till last login(yesterday). When I tried to open an existing connection(today), this error was popped up. I was trying to convert tables from MSSQL to MySQL yesterday.
Detailed error message
MySQL workbench has encountered a problem Parameter is not valid
We are sorry for the inconvenience but an unexpected exception has been raised by one of the MySQL Workbench modules. In order to fix this issue we would kindly ask you to file a bug report. You can do that by pressing the [Report Bug] button below.
Please make sure to include a detailed description of your actions that lead to this problem.
Thanks a lot for taking the time to help us improve MySQL Workbench!
The MySQL Workbench Team
This is not about the normal login but migration in MySQL Workbench. This part uses separate logins to source and target servers. If your connection to the MS SQL server worked yesterday and you didn't change anything in MySQL Workbench then it is very likely something with your MS SQL server happened. So, someone needs to check if that server is still running properly and can be accessed from your machine.