This error generated by IIS 8 implements Configuration Locking, so allow the overrideModeDefault.

open the file applicationHost.config file in C:\Windows\System32\inetsrv\config 
or open the  %windir%\system32\inetsrv\config\applicationHost.config

To edit the "handlers" section
 

 <section name=”handlers” overrideModeDefault=”Deny” />

to
 
<section name=”handlers” overrideModeDefault=”Allow”/>

Now, again refresh your page.