Problem: When I open my old projects in Visual Studio Enterprise 2017 with Resharper plugin, I get the following warnings: Please note that the problem does not take place for new projects. But somehow it still occurs when I remove and recreate my old projects. The problem is inconsistent when I disable Resharper. Warnings sometimes show up, sometimes don't. What I've already tried: - Reinstalling everything (Removing Unity, VS, R# and installing them all over). - Removing everything except Assets folder in the project folder. - Cleaning Resharper cache. - Re-creating the whole Unity project. - Clicking the middle option on the prompt (Let Resharper call MSBuild... option). It does not help. The problem persists. Any help is appreciated.