Section or group name 'oracle.manageddataaccess.client' is already defined

section or group name 'system web extensions is already defined
section or group name 'oracle.manageddataaccess.client' is already defined
configsections> <section type
c# configuration section group

after updating the Oracle.ManagedDataAccess dll from version 4.121.1.0 to version 4.121.2.0, since I could not save values of type CLOB in the previous version using NHibernate, on the client machine it gave this error: System.TypeInitializationException: The type initializer for 'OracleInternal.Common.ProviderConfig' threw an exception. ---> System.Configuration.ConfigurationErrorsException: Configuration system failed to initialize ---> System.Configuration.ConfigurationErrorsException: Section or group name 'oracle.manageddataaccess.client' is already defined. Updates to this may only occur at the configuration level where it is defined.

On my development machine this does not occur, I looked at the machine.config files of his machine and this section is not included, I already tried with and without the settings that Nuget added in the app.config, but nothing seems to work. Anyone know how I can resolve this? Thank you


Remove the section with oracle.manageddataaccess.client from your machine.config.

The readme from the NuGet Package tells you to do so.

Section or group name 'My.MySettings' is already defined, Please review the specific error details below and modify your configuration file appropriately. Parser Error Message: Section or group name 'My. Declaring a section group creates a container tag for configuration sections and ensures that there are no naming conflicts with configuration sections defined by someone else. You can nest <sectionGroup> elements within each other.


drop into the app.config and remove or comment this section:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<!-- <configSections>
        <section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.122.18.3, Culture=neutral, PublicKeyToken=89b483f429c47342"/>
</configSections> -->
<startup> 
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5"/>
</startup>
<system.data>

<sectionGroup> element for <configSections>, Syntax. XML Copy. <sectionGroup name="section group name"> <!-- Configuration sections --> </sectionGroup>  Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. Learn more Section or group name 'system.web.webPages.razor' is already defined.


I got this same error "The type initializer for 'OracleInternal.Common.ProviderConfig' threw an exception".

When I ran my app, in my Console error messages, "There is a duplicate 'oracle.manageddataaccess.client' section defined."

Turns out the definition for Oracle.ManagedDataAccess was in my WebAPI web.config and also the machine config.

Had to update THIS specific machine.config: C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config - do a search on "managed" and comment out in 3 places.

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