Oracle .Net ManagedDataAccess Error: Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly

Question

I have a project that works locally, on our dev server, and on our production server.

When I try to run it on the test server, I get the error below, and I don't know what to do about it beyond stare at my screen blankly. Hints? Process to trace the issue to its source?

I've installed the NuGet package for Oracle 12.2, etc.

Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly 'Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342'. 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.TypeLoadException: Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly 'Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342'.

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:

[TypeLoadException: Could not load type 'OracleInternal.Common.ConfigBaseClass' from assembly 'Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342'.]
Oracle.ManagedDataAccess.EntityFramework.EntityFrameworkProviderSettings.Oracle.ManagedDataAccess.EntityFramework.EFProviderSettings.IEFProviderSettings.get_TracingEnabled() +0 Oracle.ManagedDataAccess.EntityFramework.EFProviderSettings.InitializeProviderSettings() +111 Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices..ctor() +629 Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices..cctor() +28

[TypeInitializationException: The type initializer for 'Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices' threw an exception.]
Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices.get_Instance() +24

The Web.Config has the following blocks in it:

  <configSections>     <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->     <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />     <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.2.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />   </configSections> 

AND

  <oracle.manageddataaccess.client>     <version number="*">       <dataSources>         <dataSource alias="PVMDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=pdxcludds108.pacificorp.us)(PORT=11086))(CONNECT_DATA=(SERVICE_NAME=DDS1086.PACIFICORP.US))) " />       </dataSources>     </version>   </oracle.manageddataaccess.client>   <connectionStrings>     <add name="OracleDbContext" providerName="Oracle.ManagedDataAccess.Client" connectionString="User Id=USERID;Password=WORKINGPASSWORD;Data Source=PVMDataSource" />     <add name="PVMEntities" connectionString="metadata=res://*/Models.PVMModel.csdl|res://*/Models.PVMModel.ssdl|res://*/Models.PVMModel.msl;provider=Oracle.ManagedDataAccess.Client;provider connection string=&quot;DATA SOURCE=pdxcludds108.pacificorp.us:11086/DDS1086.PACIFICORP.US;PASSWORD=XXXXXXX;PERSIST SECURITY INFO=True;USER ID=XXX&quot;" providerName="System.Data.EntityClient" />   </connectionStrings> 

NOTE: There are other projects working on this server, they're just using a different version of the Oracle client for .Net. None of the others is using only the Managed driver. I am looking for a way to dig into this error, some hint as to where that type is sourced and loaded from.

Answer 1

There is a conflict between Oracle.ManagedDataAccess from NuGet and the one that is installed (by Oracle client installation) on a server and that is registered in GAC.

Unregister Oracle.ManagedDataAccess from GAC and you will get rid of the error: Run command line and navigate to the directory:

{Oracle home}\product\{version}\client_64\ODP.NET\managed\x64

There you should find OraProvCfg.exe file. Run the following command to unregister Oracle.ManagedDataAccess from GAC:

OraProvCfg /action:ungac /providerPath:Oracle.ManagedDataAccess  

Answer 2

You have to remove the Oracle.ManagedDataAccess assembly in your GAC (C:\Windows\Microsoft.NET\assembly...)

Use the command tool gacutil to remove the assembly:

C:\Program Files (x86)\Microsoft SDKs\Windows\YOUR_VERSION\bin\NETFX 4.6.1 Tools> gacutil /u Oracle.ManagedDataAccess