<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial">Hi<br><br>I want to compare the difference from the data from two dataset with the same grid topology. I load in two dataset separately, then apply the PythonCalculator filter, but immediately encounter the following error. What is the problem? The version is 4.1 for 32bit linux OS.<br><br>ERROR: In /home/utkarsh/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx, line 815<br>vtkPVCompositeDataPipeline (0xb4711d0): Input for connection index 0 on input port index 0 for algorithm vtkPythonCalculator(0xb4aa0b0) is of type vtkMultiBlockDataSet, but a vtkDataSet is required.<br><br><br>ERROR: In /home/utkarsh/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx, line 815<br>vtkPVCompositeDataPipeline (0xb4711d0): Input for connection index 1 on input port index 0 for algorithm vtkPythonCalculator(0xb4aa0b0) is of type vtkMultiBlockDataSet, but a vtkDataSet is required.<br><br><br>ERROR: In /home/utkarsh/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx, line 815<br>vtkPVCompositeDataPipeline (0xb4711d0): Input for connection index 0 on input port index 0 for algorithm vtkPythonCalculator(0xb4aa0b0) is of type vtkMultiBlockDataSet, but a vtkDataSet is required.<br><br><br>ERROR: In /home/utkarsh/Dashboards/MyTests/NightlyMaster/ParaViewSuperbuild-Release/paraview/src/paraview/VTK/Common/ExecutionModel/vtkDemandDrivenPipeline.cxx, line 815<br>vtkPVCompositeDataPipeline (0xb4711d0): Input for connection index 1 on input port index 0 for algorithm vtkPythonCalculator(0xb4aa0b0) is of type vtkMultiBlockDataSet, but a vtkDataSet is required.<br><br><br><br><br><br><br><br></div><br><br><span title="neteasefooter"><span id="netease_mail_footer"></span></span>