Description: An error occurred during the processing of a configuration file required to service this request. Please review the specific error details below and modify your configuration file appropriately.
Parser Error Message: The element 'buildProviders' cannot be defined below the application level.
what that error says is that element can only be present on the web.config placed on the top level folder of an application dir. in this case, i think that you have a sub directory with your site and this sub directory isn't configured in IIS as a web application. so, copying that line to the web.config file placed at the top folder or configuring IIS so that the sub directory is configure as an app should solve this.