exePath must be specified when not running inside a stand alone exe.

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C#

C#4.0

web.config

When i am using a web application, the line of code below
Configuration objConfig = ConfigurationManager.OpenExeConfiguration( ConfigurationUserLevel.None);
in class library are giving this error."exePath must be specified when not running inside a stand alone exe." Previously a console application was being used, and the code could access the app.config. I tried using the System.Web.Configuration in class library but the dll was not present in the .Net tab for "Add reference". Kindly help