Error 'QueryInterface for interface Microsoft.eConnect.ieConnect_API failed.'

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Issue

Error - 'QueryInterface for interface Microsoft.eConnect.ieConnect_API failed.' is being returned in a C# application which is calling the eConnect_EntryPoint method of the eConnect_API assembly.

Resolution

This error typically indicates a problem with the reference to the eConnect_API.dll in your C# project. Use the following steps:

1. Insert the eConnect_API.dll located in your "C:\Program Files\Microsoft Great Plains\eConnect7\MBS eConnect EAI Incoming Service 7.0" directory into the Global Assembly Cache (GAC). This can be done by using the GACUTIL.exe utility provided with Visual Studio .NET. For more information on using this utility refer to the Help documentation in the Visual Studio .NET IDE.

2. Remove the reference to the eConnect_API.dll in your C# project and then add it back in. When adding it back to the project, be sure to browse to the eConnect_API.dll located in your "C:\Program Files\Microsoft Great Plains\eConnect7\MBS eConnect EAI Incoming Service 7.0" directory.

3. Go into Component Services on the workstation and delete the Microsoft Business Solutions eConnectAPI COM+ application. This will get recreated when your application calls it the next time.

This article was TechKnowledge Document ID: 29309