Actually error says everything clearly;

Your project path contains non-ASCII characters. This will most likely cause the build to fail on Windows. Please move your project to a different directory.

Your project path has Non-ASCII Character, for your case its seems like the "Ü" char at "/Masaüstü/".

For the solution; you can change the project location to another file what its not has a non-ASCII char or open a folder outside the desktop and do not contain any non-ASCII characters. Do not contain any Turkish characters like ü,ğ,ö etc.