This error shows up with web applications and/or web services that use the Biztalk LOB Adapters for Oracle and the server doesn´t have the required assemblies.
To fix it just install:
The WCF LOB Adapter
Then the biztalk adapter pack
And declare the binding either on the machine.config for the whole server or in the web.config of the particular web app
<system.serviceModel>
<extensions>
<bindingElementExtensions>
<add name="oracleDBAdapter" type="Microsoft.Adapters.OracleDB.OracleDBAdapterExtensionElement,Microsoft.Adapters.OracleDB, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</bindingElementExtensions>
<bindingExtensions>
<add name="oracleDBBinding" type="Microsoft.Adapters.OracleDB.OracleDBAdapterBindingSection,Microsoft.Adapters.OracleDB, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</bindingExtensions>
</extensions>
</system.serviceModel>
Both downloads can be found easily on the Microsoft Downloads web site