Word VSTO 4.0 Addin fails to load: Could not load file or assembly

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Hello there guys...

The issue in short is that I created a Word VSTO addin that works perfectly fine on a number of machines, but fails to load on one machine only. I don't know if the problem is in the assembly name, or there is a missing DLL.

The details of how that is done and the error message are as follows:

1- IDE: Microsoft Visual Studio Community 2013.

2- Office version installed: 2010 for all the machines

3- .NET framework used: 4.0.

4- The target machines have the file vstor_redist.exe installed.

5- The way the VSTO file is installed is through copying the VSTO into program files, then running it. This works for all the machines even the ones that fails to load the add in.

6- The Addin has a ribbon control. Don't know if that has any effect on the matter.

7- Development machine: windows 7 64bit

8- Testing machines: windows 7 64bit. (even the one that fails to load the addin)

9- The error message I am getting when the assembly loads for one machine only is:

Could not load file or assembly 'IDMSWord2010AddinProject, Version=4.3.0.0, Culture=neutral, PublicKeyToken=83105d2b5774c812' or one of its dependencies. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047)

************** Exception Text ************** System.IO.FileLoadException: Could not load file or assembly 'IDMSWord2010AddinProject, Version=4.3.0.0, Culture=neutral, PublicKeyToken=83105d2b5774c812' or one of its dependencies. The given assembly name or codebase was invalid. (Exception from HRESULT: 0x80131047) File name: 'IDMSWord2010AddinProject, Version=4.3.0.0, Culture=neutral, PublicKeyToken=83105d2b5774c812' at System.Reflection.RuntimeAssembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, RuntimeAssembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection, Boolean suppressSecurityChecks) at System.Reflection.RuntimeAssembly.InternalLoadAssemblyName(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection, Boolean suppressSecurityChecks) at System.Reflection.RuntimeAssembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection) at System.Reflection.Assembly.Load(String assemblyString) at Microsoft.VisualStudio.Tools.Office.Runtime.DomainCreator.ExecuteCustomization.CreateEntryPoint(String entryPointTypeName) at Microsoft.VisualStudio.Tools.Office.Runtime.DomainCreator.ExecuteCustomization.Microsoft.VisualStudio.Tools.Office.Runtime.Interop.IExecuteCustomization2.LoadEntryPoints(IntPtr serviceProvider)

************** Loaded Assemblies ************** mscorlib Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1026 (RTMGDR.030319-1000)

CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll

Microsoft.VisualStudio.Tools.Office.Runtime Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Office.Runtime/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Office.Runtime.dll

System.Core Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.233 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll

System Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1026 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll

Microsoft.VisualStudio.Tools.Applications.Hosting Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.Hosting/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.Hosting.dll

Microsoft.VisualStudio.Tools.Applications.Runtime Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.Runtime/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.Runtime.dll

System.Xml Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1026 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll

System.Configuration Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1015 (RTMGDR.030319-1000)

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

System.Deployment Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1029 (RTMGDR.030319-1000)

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Deployment/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Deployment.dll

Microsoft.VisualStudio.Tools.Applications.ServerDocument Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualStudio.Tools.Applications.ServerDocument/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualStudio.Tools.Applications.ServerDocument.dll

System.Windows.Forms Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1002 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

System.Drawing Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1001 built by: RTMGDR

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

System.Xml.Linq Assembly Version: 4.0.0.0 Win32 Version: 4.0.30319.1 built by: RTMRel

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml.Linq/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.Linq.dll

Microsoft.Office.Tools Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.dll

Microsoft.Office.Tools.Word.Implementation Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Word.Implementation/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Word.Implementation.dll

Microsoft.Office.Tools.Common.Implementation Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Common.Implementation/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Common.Implementation.dll

Microsoft.Office.Tools.Common Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Common/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Common.dll

Microsoft.Office.Tools.Word Assembly Version: 10.0.0.0 Win32 Version: 10.0.50903.0

CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.Office.Tools.Word/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.Office.Tools.Word.dll

Any help or advice is highly appreciated.

Yours sincerely

Posted 3-May-15 11:54am

mkaatr2

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Dave Kreskowiak · Accepted Answer · 2015-05-03T12:21:00

Solution 1

What is the architecture of Office, not Windows. 32-bit or 64-bit? Normally, Office is 32-bit but it would appear that the one machine may have 64-bit Office. Your add-in has to match the architecture of Office, not Windows.

Posted 3-May-15 12:21pm

Dave Kreskowiak

Comments

mkaatr2 4-May-15 0:28am

I totally forgot that. I will check it out and see if office on that machine is 64bit not 32.

Thanks

mkaatr2 4-May-15 4:37am

That solved the problem. Just compiled to 64bit, and it worked.

Thank you Dave. You saved us from a long headache.

Dave Kreskowiak 4-May-15 8:01am

No problem.