Refused to display ‘https://www.domain.com/admin/top.php’ in a frame because it set ‘X-Frame-Options’ to ‘deny’.

Setting this up, on your .htaccess might solve the problem

Header set X-Frame-Options SAMEORIGIN

But, I have multiple frames…

Refused to display ‘https://www.domain.com/admin/top.php’ in a frame because it set multiple ‘X-Frame-Options’ headers with conflicting values (‘DENY, SAMEORIGIN’). Falling back to ‘deny’.

This worked out!

Header always unset X-Frame-Options

As seen on https://stackoverflow.com/questions/17092154/x-frame-options-on-apache