[Paraview] Maximum number of pieces, what does it mean?

[Fred Fred]

I get this error when I select the 2nd output as displayable, although it contains 4 cells and 10 points, so it is not empty.
What does it mean?

ERROR: In /usr/local/ParaView3/VTK/Filtering/vtkStreamingDemandDrivenPipeline.cxx, line 806
vtkCompositeDataPipeline
(0x2361e150): No maximum number of pieces has been set in the
information for output port 1 on algorithm vtkFlowCoordinates(0x2361d8c0).

 		 	   		  
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