c# - FileNotFoundException when loading dll

Question

When I try to execute my program I receive FileNotFoundException, howerver dll exist in the same folder. How is that possible and how to fix the problem? Output below translated from localized messages of Russian Windows Server 2008 R2 Foundation:

C:Oleginfast>FAST.exe

Exception: System.IO.FileNotFoundException: Can't load "QuickFASTDotNet.dll"
or dependent component. Can't find this file.
in FAST.FAST..ctor()
in FAST.Program.Main(String[] args) in C:OlegfastFASTFAST
Program.cs:line 474

C:Oleginfast>dir QuickFASTDotNet.dll
    16.02.2012  16:45           117?760 QuickFASTDotNet.dll

The same binaries work on my Windows 7 machine (but doesn't work on another Windows Server 2008 R2 Foundation machine).

Answer 1

Please check out Debugging Assembly Loading Failures.

Most likely reason is some related file is not installed in the GAC on you Server machines, or x86/x64 mismatch.