[thredds] Question about TDS4.2 WMS


We recently updated to Thredds4.2. When I tried to access WMS, it turns back the following error:


 HTTP Status 500 - Internal Server Error


*Status* 500 - Internal Server Error


     THREDDS Data Server Version 4.0 -- Documentation


I am new in using Thredds. I would really appreciate if anyone could help me in this.

Thanks a lot,