From time to time Visual Studio builds will error for some unexplained reason, especially after getting new source from source control. It’s because these temporary and cached files that are not removed by Visual Studio and can cause these types of issues. Also these files can take up space on your hard drive.
https://dotnettips.wordpress.com/2016/02/26/dotnettips-dotnetfilecleaner-application/
https://dotnettips.wordpress.com/2016/02/26/dotnettips-dotnetfilecleaner-application/