Asp.Net configuration tool error

Hi. I am facing a problem while doing my project. Actually when i launches "Asp.Net Configuration tool" it shows an error as shown below:


System.ArgumentException: The parameter 'PhysicalDirectory' is invalid. Parameter name: PhysicalDirectory at System.Web.Configuration.VirtualDirectoryMapping.set_PhysicalDirectory(String value) at System.Web.Configuration.VirtualDirectoryMapping..ctor(String physicalDirectory, Boolean isAppRoot) at System.Web.Administration.WebAdminPage.OpenWebConfiguration(String path, String appPhysPath, Boolean getWebConfigForSubDir) at System.Web.Administration.WebAdminPage.OpenWebConfiguration(String path, Boolean getWebConfigForSubDir) at System.Web.Administration.WebAdminPage.VerifyAppValid()
please give me the solution why this error is produced. Tahnx in advance..



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