When we open up existing SSIS project, we always get this error.
TITLE: Microsoft Visual Studio
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Unable to cast COM object of type 'Microsoft.SqlServer.Dts.Runtime.Wrapper.PackageNeutralClass' to interface type 'Microsoft.SqlServer.Dts.Runtime.IObjectWithSite'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{FC4801A3-2BA9-11CF-A229-00AA003D7352}' failed due to the following error: The application called an interface that was marshalled for a different thread. (Exception from HRESULT: 0x8001010E (RPC_E_WRONG_THREAD)).
Resolution :
To fix the problem do the following:
1. Open the command prompt
2. Navigate to C:\Program Files\Microsoft SQL Server\90\DTS\Binn
3. Run C:\Program Files\Microsoft SQL Server\90\DTS\Binn>regsvr32 dts.dll
That should fix the problem.
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