After installing a few plugins, I am unable to access the main site (WISE) dashboard

Hello Support

After installing the dashboard, site pro, domain mapping and marketpress, I am unable to access the dashboard for the main site (Blog ID - 1) via My Sites > WISE > Dashboard.

It throws the error pasted below -:

"Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator to inform of the time the error occurred and of anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

Web Server at"

Is there something I am doing wrong?

Kindly help.