Failed to find or load the registered .Net Framework Data Provider.

I have been geeting this errot
Failed to find or load the registered .Net Framework Data Provider.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Configuration.ConfigurationErrorsException: Failed to find or load the registered .Net Framework Data Provider.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


[ConfigurationErrorsException: Failed to find or load the registered .Net Framework Data Provider.]
   System.Data.Common.DbProviderFactories.GetFactory(DataRow providerRow) +1479473
   System.Data.Common.DbProviderFactories.GetFactory(String providerInvariantName) +88
   System.Data.EntityClient.EntityConnection.GetFactory(String providerString) +26
   System.Data.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString) +246
   System.Data.EntityClient.EntityConnection..ctor(String connectionString) +43
   System.Data.Objects.ObjectContext.CreateEntityConnection(String connectionString) +85
   System.Data.Objects.ObjectContext..ctor(String connectionString, String defaultContainerName) +16


machine.config

<DbProviderFactories>
      <add name="Oracle Data Provider for .NET" invariant="Oracle.DataAccess.Client" description="Oracle Data Provider for .NET" type="Oracle.DataAccess.Client.OracleClientFactory, Oracle.DataAccess, Version=4.112.3.0, Culture=neutral, PublicKeyToken=*******9c47342"/>
</DbProviderFactories>


Any Idea What I'm missing here? Please advise