Alright I managed to solve the problem.

Open IIS > Find your site > HTTP Response

If there is X-Frame-Options:Deny, Then just remove it. Or try to Allow it.

Removing X-Frame-Options worked wonders for me.

Alright I managed to solve the problem.

Open IIS > Find your site > HTTP Response

If there is X-Frame-Options:Deny, Then just remove it or set value to "SAMEORIGIN".

Removing X-Frame-Options worked wonders for me.

Note: To know more about X-Frame-Options I recommend reading Combating ClickJacking With X-Frame-Options and Mitigating framesniffing with the X-Frame-Options header.