MSB4019
This error occurs when MSBuild tries to import a file, but the file couldn't be found. The imported file must be an XML MSBuild file, such as a .props file, or .targets file, or any other file that contains XML that is intended to be interpreted by MSBuild.
The full message resembles the following text:
MSB4019: The imported project 'name' was not found. Confirm that the expression in the Import declaration 'declaration' is correct, and that the file exists on disk.
Check the syntax of the import declaration, check the path of the imported file, and make sure the spelling of the filename is correct.