IIS 7 implements "Configuration Locking". This is to help with IIS administration.
Here, look at the error details and how to resolve the same:
IIS 7 – This configuration section cannot be used at this path.[
^]
As per it, one of the resolution:
1. Open the applicationHost.config file, located here:
%windir%\system32\inetsrv\config\applicationHost.config
2. Edit the "handlers" section.
3. Change this line:
<section name="handlers" overrideModeDefault="Deny" />
To:
<section name="handlers" overrideModeDefault="Allow" />