The "SourceRootPath" parameter is not supported by the "TransformXml" task

Question

In an ASP.NET project I'm getting the error while publishing

C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VisualStudio\v16.0\Web\Microsoft.Web.Publishing.targets(1485,19):
Error MSB4064: The "SourceRootPath" parameter is not supported by the "TransformXml" task. 
Verify the parameter exists on the task, and it is a settable public instance property.

What does it mean and what could cause it occur? I got it after migrating packages.config to PackageReference.

score 0 · Answer 1 · answered Sep 18 '21 at 08:20

I discovered that this problem would only occur when there was a web.config transformation being done at publish time. Transformations at build time would not suffer from this error. So I took the following steps to make the web.config transformation be done at build time.

The "SourceRootPath" parameter is not supported by the "TransformXml" task

1 Answers1