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The type initializer for ‘System.Data.SqlClient.SqlConnection’ threw an exception


Recently I encountered a scenario where a client machine was returning the error, “The type initializer for ‘System.Data.SqlClient.SqlConnection’ threw an exception”, when running a map that connects to SQL. 

The error message is a standard .NET Framework error, that is saying .NET can’t create the SQL connection.

The error is caused by a corruption of the .NET installation on the user’s machine.

Steps to resolve

  1. Verify that the correct version of .NET is installed for your version of SmartConnect. You can find the required version in the prerequisites section of the User manual.
  2. Try running the Microsoft .NET Framework Repair Tool.
  3. If that does not work, uninstall the existing installation and reinstall the .NET Framework.

If you have any questions, feel free to contact support@eonesolutions.com

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