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The 'DbProviderFactories' section can only appear once per config file" ERROR message

  • Updated
Overview:


Solution:

This happens when the section is duplicated in the machine.config file. This is a known .NET issue. To fix it, remove the duplicate from the machine.config files.

Two files to modify:

C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config

C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config

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