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Instructions

  1. Completely uninstall and reinstall oracle 12c. The installer we used was from the zip folder in \\TC4S0A\GROUPS\AARA\AARAD\Software Library\Developer Tools\Oracle, followed a standard installation, except for not installing any VS dev tools, and installed it system-wide.

  2. Unconfigure Oracle’s GAC with the attached bat file (This is now in the \\Tc4s0a\groups\AARA\AARAD\NORMS folder)

  3. Installed the latest ODT from Oracle’s website

    <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.18.3, Culture=neutral, PublicKeyToken=89b483f429c47342"/>
<oracle.manageddataaccess.client>
  <version number="*">
    <settings>
      <setting name="NAMES.DIRECTORY_PATH" value="TNSNAMES"/>
    </settings><dataSources>
    <dataSource alias="SampleDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL))) "/>
    </dataSources>
  </version>
</oracle.manageddataaccess.client>

  4. Verify the machine.config files in C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config, and C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config.

    I had Version=4.122.18.3 in the Web.config and Version=4.122.21.1 in the machine.config.

    I updated the version, replaced Version=4.122.18.3 of Web.config to Version=4.122.21.1 and oracle.manageddataaccess.client with 4.122.21.1 in both the machine.config, and the issue was resolved.

Note: If you have an error to debug the app, verify the configurations below

1) Provider
<configuration>
  <providers>
    <provider invariantName="Oracle.ManagedDataAccess.Client" type="Oracle.ManagedDataAccess.EntityFramework.EFOracleProviderServices, Oracle.ManagedDataAccess.EntityFramework, Version=6.122.21.1, Culture=neutral, PublicKeyToken=89b483f429c47342" />
  </providers>
</configuration>

2) Configuration Section Handler

The following entry is added to the app/web.config to enable applications to add an <oracle.manageddataaccess.client> 
section for ODP.NET, Managed Driver-specific configuration:

<configuration>
  <configSections>
    <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.21.1, Culture=neutral, PublicKeyToken=89b483f429c47342" />
  </configSections>
</configuration>

3) DbProviderFactories

The following entry is added for applications that use DbProviderFactories and DbProviderFactory classes. Also, any 
DbProviderFactories entry for "Oracle.ManagedDataAccess.Client" in the machine.config will be ignored with the following 
entry:

<configuration>
  <system.data>
    <DbProviderFactories>
      <remove invariant="Oracle.ManagedDataAccess.Client" />
      <add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.122.21.1, Culture=neutral, PublicKeyToken=89b483f429c47342" />
    </DbProviderFactories>
  </system.data>
</configuration>

4) Dependent Assembly
<configuration>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <publisherPolicy apply="no" />
        <assemblyIdentity name="Oracle.ManagedDataAccess" publicKeyToken="89b483f429c47342" culture="neutral" />
        <bindingRedirect oldVersion="4.122.0.0 - 4.65535.65535.65535" newVersion="4.122.21.1" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

5) Data Sources
<configuration>
  <oracle.manageddataaccess.client>
    <version number="*">
      <dataSources>
        <dataSource alias="SampleDataSource" descriptor="(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=localhost)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL))) " />
      </dataSources>
    </version>
  </oracle.manageddataaccess.client>
</configuration>

Reference: https://stackoverflow.com/questions/33312848/oracle-odp-net-error

If after doing these fixes, NORMS runs but has nothing appear on the actual webpage, please see this article: How to Fix NORMS When It Displays Nothing When Running Locally

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