C# app.config file errors.

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C#

WinForms

I am getting errors in my app.config file when I start my project.

System.Configuration.ConfigurationErrorsException: 'Configuration system failed to initialize'

ConfigurationErrorsException: Unrecognized configuration section system.net. (C:\Repos\Test_Email\XXXXXXX\bin\Debug\net5.0-windows\SpeadIMUI.dll.config line 3)

App.Config file:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <system.net>
    <mailSettings>
      <smtp deliveryMethod="Network">
        <network host="xxxx.xxxxxx.com" port="993" userName="xxx@xxxxxx.com" password="XXXXXXXXX" defaultCredentials="false" enableSsl="true" targetName="STARTTLS/mail.xxxxxxxx.com" />
      </smtp>
    </mailSettings>
  </system.net>
 <connectionStrings>
    <add name="testing1" connectionString="Server=localhost;Port=3306;database=AAAA;user id=BBBB;password=XXXXX" /> 
 </connectionStrings>
</configuration>

What I have tried:

If I remove system.net it errors on mailSettings. I have searched and cannot find anything on this. I think it might have something to do with .net 5 but not sure.