dump is already unscaled error

Dear all
I am converting Liggghts dump files to vtk format, but there is a problem that OPENFoam and Liggghts scale in Paraview are not the same.
the error is:

python -i /home/talat/LPP/pizza-9Oct15/src/pizza.py
Pizza.py (9 Oct 2015), a toolkit written in Python
type ? for help, CTRL-D to quit
Loading tools ...
No handlers could be found for logger "OpenGL.Tk"
gl tool did not load:
can't find package Togl
> vtk(dump("dump.*")).manyGran("out")
6600000 6800000 7000000 7200000 7400000 7600000 7800000 8000000 8200000 8400000
read 10 snapshots
10 snapshots selected out of 10
assigned columns: id type x y z radius
dump is already unscaled
Traceback (most recent call last):
File "", line 1, in
AttributeError: vtk instance has no attribute 'manyGran'
>

how can I fix this? any help is appreciated.
Talat,