[vtkusers] Pipeline input connection error

[Fred Fred]

I have written a new class, inherited from vtkStreamTracer. Till know I was using vtk-5.2 and everything was working well.
I now use the version of VTK contained in the ParaView-3.6.1 release and I get the following error:

ERROR: In /usr/local/ParaView-3.6.1/VTK/Filtering/vtkDemandDrivenPipeline.cxx, line 803
vtkCompositeDataPipeline (0x452cd80): Input for connection index 0 on input port index 0 for algorithm vtkStreamPlacer(0x452c3f0) is NULL, but a vtkDataObject is required.

I did not change anything, I still have a vtkMyTracer and I connect it to a reader as follows:

myTracer->SetInputConnection(reader->GetOutputPort());

So any idea of what has changed from vtk-5.2 to the current version?

 		 	   		  
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