vtkTableBasedClipDataSet.cxx line 1810 Error - no input scalars

Hi,

I am not able to resolve this issue.

And here is a picture of the outcome.
The bottom half is missing. It should not be possible to see the “hole” as this is all one solid block.
isoVolume|690x269

Everytime I try to use isovolume I only get a strange toppart or surface and the error message as in the header:
vtkTableBasedClipDataSet.cxx line 1810 Error
vtkPVClipDataSet (0x59688dc0)

The data I use is from openFoam 2012, the software is Paraview 5.7.0

Any help is appreciated!
Terry