This error message is the generic error message that is thrown when any error is encountered in the website. While there can be multiple reasons for the error (coding issue, permission issue, etc), it becomes important to know the exact error message to fix the same.
To view the exact error message, you will need to enablethe actual errors from the web.config file in the root of your domain by adding the below lines inside the <system.webserver> tag: <httpErrors errorMode="Detailed" /> If you are are having a classic ASP application, you can view the detailed ASP error message by adding below lines: