Response.Headers -->This operation requires IIS integrated pipeline mode.

Try the following Solution:


Your Application Pool is in classic mode but your Application need integrated mode to fire. change it to Integrated Mode:

1. Open IIS Manager
2. Application Pool
3. Select pool that your app are run in it (in case same app pool is used in multiple published web applications, in that case create a new appl. pool for this web application)
4. In right panel select Basic Setting
5. Manage Pipeline Mode change to Integrated