Could not load file or assembly (.NET, Visual Studio 2010)

Question

I'm getting an error that is baffling me complete. I have a .NET Application that pulls in a reference to an OCX file used to automate a 3rd party program. This applications works perfectly when I run it from within Visual Studio, but when I package it in an MSI file and install it on a test machine, it fails saying "Could not load file or assembly "Interop.OISSERVERLib, ...".

Does anyone have any suggestions on how I can deal with this?

System.InvalidOperationException was unhandled
Message=An error occurred creating the form. See Exception.InnerException for details.  The error is: Could not load file or assembly 'Interop.OISSERVERLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
Source=SLSClaimantWorkbook
StackTrace:
   at SLSClaimantWorkbook.My.MyProject.MyForms.Create__Instance__[T](T Instance) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 190
   at SLSClaimantWorkbook.My.MyProject.MyForms.get_SLSClaimantWorkbook()
   at SLSClaimantWorkbook.My.MyApplication.OnCreateMainForm() in C:\Documents and Settings\C15919\My Documents\Visual Studio 2005\Claimant Workbook\Claimant Workbook\My Project\Application.Designer.vb:line 35
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.OnRun()
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.DoApplicationModel()
   at Microsoft.VisualBasic.ApplicationServices.WindowsFormsApplicationBase.Run(String[] commandLine)
   at SLSClaimantWorkbook.My.MyApplication.Main(String[] Args) in 17d14f5c-a337-4978-8281-53493378c1071.vb:line 81
InnerException: System.IO.FileNotFoundException
   Message=Could not load file or assembly 'Interop.OISSERVERLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.
   Source=SLSClaimantWorkbook
   FileName=Interop.OISSERVERLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
   FusionLog=WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].

   StackTrace:
        at SLSClaimantWorkbook.SLSClaimantWorkbook..ctor()
   InnerException:

EDIT: Assembly binding info:

The operation failed.
Bind result: hr = 0x80070002. The system cannot find the file specified.

Assembly manager loaded from:  c:\WINNT\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll
Running under executable  C:\Program Files\SLS\Claimant Workbook\SLSClaimantWorkbook.exe
--- A detailed error log follows. 

=== Pre-bind state information ===
LOG: User = INTERNAL\C15919
LOG: DisplayName = Interop.OISSERVERLib, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null
 (Fully-specified)
LOG: Appbase = file:///C:/Program Files/SLS/Claimant Workbook/
LOG: Initial PrivatePath = NULL
LOG: Dynamic Base = NULL
LOG: Cache Base = NULL
LOG: AppName = SLSClaimantWorkbook.exe
Calling assembly : SLSClaimantWorkbook, Version=0.9.31.11788, Culture=neutral, PublicKeyToken=null.
===
LOG: This bind starts in default load context.
LOG: Using application configuration file: C:\Program Files\SLS\Claimant Workbook\SLSClaimantWorkbook.exe.config
LOG: Using machine configuration file from c:\WINNT\Microsoft.NET\Framework\v2.0.50727\config\machine.config.
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind).
LOG: Attempting download of new URL file:///C:/Program Files/SLS/Claimant Workbook/Interop.OISSERVERLib.DLL.
LOG: Attempting download of new URL file:///C:/Program Files/SLS/Claimant Workbook/Interop.OISSERVERLib/Interop.OISSERVERLib.DLL.
LOG: Attempting download of new URL file:///C:/Program Files/SLS/Claimant Workbook/Interop.OISSERVERLib.EXE.
LOG: Attempting download of new URL file:///C:/Program Files/SLS/Claimant Workbook/Interop.OISSERVERLib/Interop.OISSERVERLib.EXE.
LOG: All probing URLs attempted and failed.

You forgot to deploy the interop library, required. Next possible failure mode is forgetting to deploy and register the OCX file on the target machine. — Hans Passant, Oct 11 '11 at 00:36
The interop library is being deployed with the package. I'm not sure why it can't find it. Is there a way I can change where the application looks for the file on startup? — Dan Champagne, Oct 11 '11 at 11:53
Have you tried turning assembly binding logging on? http://stackoverflow.com/questions/255669/how-to-enable-assembly-bind-failure-logging-fusion-in-net — Matt Evans, Oct 11 '11 at 12:02
I've added the assembly binding info from the log. I'm unfamiliar with this, but it looks like it's trying to find a file named "Interop.OISSERVERLib.DLL", but the actual reference file added to Visual Studio is "OisServer.OCX". Is there a way to change the file the application is looking for? — Dan Champagne, Oct 11 '11 at 12:45

score 0 · Accepted Answer · answered Oct 11 '11 at 13:38

0

This error is because of my limited understand of how Visual Studio processes OCX files. When I added the file as a reference in the program, the program created "Interop.OISSERVERLIB.dll" and the program was using that file, not the original OCX. By browsing to the "bin\Debug" folder, I was able to add the DLL to the install file, and it is now working correctly!

Thank you all for pointing me in the right direction!

answered Oct 11 '11 at 13:38

Dan Champagne

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Just for those finding this in future, there should also be a reference to the Interop dll in the project references. Make sure that `Copy Local` is set to true to output it when you build/publish/deploy – Basic Feb 18 '13 at 11:41

Could not load file or assembly (.NET, Visual Studio 2010)

1 Answers1