HTTP Error 500.19 - Internal Server Error - 0x80070003

When I attempt to run a website I receive the following error message:-

"The requested page cannot be accessed because the related configuration data for the page is invalid."

I am Using IIS8.5

At the bottom of the error message there is further information that indicates that the error lies within the web.config file. I have had a look at the file but cannot find anything of note?

Detailed Error Information:

Module IIS Web Core  
Notification Unknown  
Handler Not yet determined  
Error Code 0x80070003  
Config Error Cannot read configuration file   
Config File \\?\D:\Inetpub\SupplierSearch\web.config

Config Source:
-1: 
 0:

Any assistance will be nuch appreciated.

Regards Peter