I am doing a version upgrade from Accpac 5.0 to 5.3A. I have already installed all the necessary product updates. I am getting the above error messages while trying to activate AP and AR. GL, Bank Services and Tax Services has been upgraded without any error. 

Appreciate assistance on this.

Note:-  5.0 database was with Pervasive SQL and I loaded the dump into MS SQL Server. 
             I came across a similar issue when I was converting the data from 5.2A to 5.3A and re-installation of the product solved the issue. Now I am on that              re-installed version of Accpac 5.3A.