Error-An Unexpected error has occurred-SharePoint

What should I do if the following error occurs?

 

The causes vary, but the following actions can be performed to see what is wrong:

1. Modify the Web. config file, search for the following three parts, and modify them.

• Callstack = "true"
• <Customerrors mode = "off"/>
• <Compilation batch = "false" DEBUG = "true">

2. Reproduce the problem. On the webpage, you will see details of the Call Stack and other errors.

3. Collect the ULS log and check whether some additional information is recorded in the log in Sharepoint.