.NET for Android error XA1038
Example messages
The 'AndroidResourceDesignerClassModifier' MSBuild property has an invalid value of 'foo'. A valid value is one of: 'public', 'internal'.
Solution
Edit your csproj directly and remove the referenced MSBuild property.
Test your project to ensure the new behavior is functionally equivalent.
If not, file an issue so a solution can be found before the deprecated flag is removed.