Build error

[vootbd]

CSC : error CS2001: Source file 'C:\Users\win10\Downloads\FolderSyncNet-master\FolderSyncNet-master\FileExtensions.cs' could not be found. [C:\Users\win10\Downloads\FolderSyncNet-master\Folde
rSyncNet-master\FolderSyncNet.csproj]
39 Warning(s)
1 Error(s)

[rchibnik]

I have the same issue - FileExtensions is missing from the repo but refrenced in the solution and classes. Also missing are some debugging configs.