Error:

The \’Metadata\’ property is read-only and cannot be set. 
-Error in AX 2102 EP


Solution: 
1. Open the web control in Visual studio 
2. Open the Design file of the web control (.ascx)
3. Click source button to view Ascx coding (HTML code)
4. Find(Ctrl + F ) Metadata in the .ascx code
5. Simply delete the word wherever it is appear in .ascx file
6. Save and deploy the web control.
7. Open the webpage again

The error is resolved.! 🙂