When submitting our web.config in the migration tool, we get below error. Is this related to our web.config, our your tool?

Server Error in '/' Application.
Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.] YAF.WebSite.MigrationTool.MigrateConfig() +8389 YAF.WebSite.MigrationTool.MigrateClick(Object sender, EventArgs e) +122 System.Web.UI.WebControls.Button.OnClick(EventArgs e) +11595807 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +273 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1889

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.8.4465.0

 web.config.txt You have insufficient rights to see the content.

Thanks for the report and the web.config. Issue is fixed you can migrate the web.config now.