I have a small VB.NET 2005 application which automates Access 2007. The application runs fine on the development machine. However, on the target machine I get the following runtime error. Access 2007 is installed on both machines. How can I resolve this problem?

"13: Unable to cast COM object of type..."



Thanks, Simon

Do you have a tlb for the DLL on both machines?
  I have a small VB.NET 2005 application which automates Access 2007. The application runs fine on the development machine. However, on the target machine I get the following runtime error. Access 2007 is installed on both machines. How can I resolve this problem?

  "13: Unable to cast COM object of type..."



  Thanks, Simon

What's a tlb?
  Do you have a tlb for the DLL on both machines?
    I have a small VB.NET 2005 application which automates Access 2007. The application runs fine on the development machine. However, on the target machine I get the following runtime error. Access 2007 is installed on both machines. How can I resolve this problem?

    "13: Unable to cast COM object of type..."



    Thanks, Simon

What's a tlb?

<copied>

COM Type Libraries are binary files with .tlb extension. Usually this files
contain information about COM interfaces and components. To use this
information, type library must be registered on target system.

<end>
http://www.google.com/search?hl=en&q=what+is+a+type+library+file&btnG=Google+Search

Hello Simon

From your post, my understanding on this issue is: you want to know how to
fix the issue that the automation client throws exception: "Unable to cast
COM object of type¡­" in the target machine, but not in development
machine. If I'm off base, please feel free to let me know.

According to your description, the automation client runs well in the
development environment. However, when it is run on another computer with
Access 2007, it throws the exception. Therefore, my guess is that the
target machine is not installed with Office 2007 PIA (Primary Interop
Assembly). Office 2007 PIA (.NET support of Office) is a group of
assemblies that helps to interoperate between .NET applications and Office
COM objects. If .NET support of Office is not selected when you are
installing Office 2007 in the target machine, the exception "Unable to cast
COM object of type¡­" might be thrown in Office automation clients. To
install Office 2007 PIA, please go to the page:
http://www.microsoft.com/downloads/details.aspx?familyid=59daebaa-bed4-4282-
a28c-b864d8bfa513&displaylang=en and install it in the target machine. Then
run your application again to see if the issue is resolved.

If the suggestion above could not help, would you let me know the type of
your Office automation client? Is it an Office COM Add-in? Is it a VSTO
one? Would you try {} catch the exception in code, print the call stack,
and let me know the line of code that throws the exception? I am looking
forward to your reply.

Sincerely,
Jialiang Ge (jia***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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Hi Simon,

Would you mind letting me know the result of the suggestions? If you need
further assistance, feel free to let me know. I will be more than happy to
be of assistance.

Have a great day!

Sincerely,
Jialiang Ge  (jia***@online.microsoft.com, remove 'online.')
Microsoft Online Community Support

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