I got the following error message when I try to deploy my .war file to the application server:
Error 500: javax.servlet.ServletException: Worklight Co
The error message looks pretty clear to me. You seem to have upgraded your Worklight installation, but did not upgrade the database scheme used for Application Center.
You need to consult with the IBM Worklight Information Center.
You do not mention how did you upgrade your installation to v6.1.0, nor what did you do. So take a look at the following topic as well regarding database upgrade, since as mentioned it looks like your DB2 database scheme for the APPCNTR database did not take place: