E_FAIL error on PackAndGo ProjectFile assignment in .NET 8 Add-in

[cgtyklsn]

Hello,

I’m using Inventor 2025 and have an add-in project built with .NET 8.

I converted the PackAndGo example code from this article:
https://adndevblog.typepad.com/manufacturing/2013/05/use-packandgo-of-2014-api.html
to C# and tried to use it in my add-in. However, when assigning the ProjectFile property, I get the following error:

{"Error HRESULT E_FAIL has been returned from a call to a COM component."}

The same code works without issues in a Windows Forms app built with .NET Framework 4.7.2.

Any advice or experiences would be appreciated. Thanks in advance!

[CGBenner]

@cgtyklsn 

Welcome to the Community.  I have moved your post here to the Programming forum so the experts can try to help you with your question.  Good luck!

[CGBenner]

@bradeneuropeArthur Is this something that you might be able to help with?

[bradeneuropeArthur]

Could you share your code. This makes it easier for me!thanks 

[cgtyklsn]

I already shared the link to the code in the post. Had you looked at it? @bradeneuropeArthur 

[bradeneuropeArthur · Accepted solution]

Is that exact the same code you use?

   Public Sub main

        Dim oPacknGoComp As New PackAndGoLib.PackAndGoComponent
        Dim oPacknGo As PackAndGoLib.PackAndGo
		Try
		MkDir("C:\Temp\PackandGo")
		Catch
		End Try
        oPacknGo = oPacknGoComp.CreatePackAndGo(ThisDoc.Document.FullFileName, "C:\Temp\PackandGo")
        'oPacknGo.ProjectFile = "D:\Files\Inventor Projects\"
        Dim sRefFiles = New String() {}
        Dim sMissFiles = New Object
        oPacknGo.SkipLibraries = True
        oPacknGo.SkipStyles = True
        oPacknGo.SkipTemplates = True
        oPacknGo.CollectWorkgroups = False
        oPacknGo.KeepFolderHierarchy = True
        oPacknGo.IncludeLinkedFiles = True
        oPacknGo.SearchForReferencedFiles(sRefFiles, sMissFiles)
        oPacknGo.AddFilesToPackage(sRefFiles)
        oPacknGo.CreatePackage()

    End Sub

This will do from within Inventor!

Let me know your thoughts.

@CGBenner @cgtyklsn 

Regards,

[cgtyklsn]

@bradeneuropeArthur 

Yes

[CGBenner]

@cgtyklsn 

Did the information provided answer your question? If so, please use Accept Solution so that others may find this in the future. Thank you very much!

[cgtyklsn]

A solution to this problem has not yet been provided.