I wonder if anyone can tell me why this is happening:
I have done ch12 "More Cleanup part2" which was challenging to follow even on video.

I can do a BUILD on any project but if I do a REBUILD on BuzzMMO.Tests, BuzzMMO.Server.Master or BuzzMMO.Server.Region I get a file locking error:

1>C:\Program Files (x86)\MSBuild\14.0\bin\Microsoft.Common.CurrentVer sion.targets(3962,5): warning MSB3026: Could not copy "D:\C#\BuzzMMO\src\BuzzMMO.Base\bin\Debug\BuzzMMO. Base.dll" to "bin\Debug\BuzzMMO.Base.dll". Beginning retry 1 in 1000ms. The process cannot access the file 'bin\Debug\BuzzMMO.Base.dll' because it is being used by another process.
This repeats for a total of 10 attempts before giving an error.

After that I cannot do a build on any of the projects that depend on BuzzMMO.Tasks.
Something has locked the file and it remains locked until I restart VS2015.

Am I doing something wrong?