Windows Authentication gives an Error on the Server

Hi There

I am deploying an ASP.NET App to our DEV and QA server using Windows Authentication (not SQL Authentication).

1.) The App is Framework 4.0 and resides in IIS 6.0

2.) Also the APP pool associated with the APP is an active directory application account which has been given access on the SQL Server too.

The the APP gives the error below on the servers.

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Exception information:
    Exception type: ProviderIncompatibleException
    Exception message: The provider did not return a ProviderManifestToken string.
   at System.Data.Common.DbProviderServices.GetProviderManifestToken(DbConnection connection)
   at System.Data.Entity.ModelConfiguration.Utilities.DbProviderServicesExtensions.GetProviderManifestTokenChecked(DbProviderServices providerServices, DbConnection connection).

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Any Help would be appreciated in resolving this error.

Thank You