C:\netmf\netmf4_4_0\BuildOutput\Public\Release\Server\dll\ is not a part of a good build
Here is my last BuildOutput directory:
C:\netmf\netmf4_4_0\BuildOutput\THUMB2FP\GCC4.9\le\FLASH\release\EspruinoWifi11\bin
Note: EspruinoWifi11 is a new solution I was building but the other directories are standard.
Your directory tree of the should be exactly like the one above without the BuiildOutput directory.
Don’t forget to the Delete the BuildOutput directory before the build starts or the solution will not build.