question of a new user

Hi all
there are 2 primery questions.
I have installed CFDEM project newly and I could run Conveyor case in tutorials of LIGGGHTS. dump files in post folder are ready but I can not visualize these results.
1) I tryed to run Pizza.py in order to convert dump files to vtk as following:
I typed the following path in a terminal in post directory:
/root/LIGGGHTS/mylpp/src/pizza.py

But the results are:

Pizza.py (LPP 1.0 based on pizza - 7 Oct 2011), a toolkit written in Python
type ? for help, CTRL-D to quit
Loading tools ...
Display not available ... no GUIs
tdump tool did not load:
No module named Numeric
dump tool did not load:
No module named Numeric
lpp tool did not load:
No module named Numeric
ldump tool did not load:
No module named Numeric
mdump tool did not load:
No module named Numeric
vcr tool did not load:
No module named _tkinter, please install the python-tk package
vmd tool did not load:
No module named numpy
plotview tool did not load:
No module named _tkinter, please install the python-tk package
image tool did not load:
No module named _tkinter, please install the python-tk package
animate tool did not load:
No module named _tkinter, please install the python-tk package
bdump tool did not load:
No module named Numeric

2)furthermore I tryed to open paraview by typing:

paraview

in a terminal But it results:

/root/OpenFOAM/ThirdParty-2.1.x/platforms/linux64Gcc/paraview-3.12.0/lib/paraview-3.12/paraview: error while loading shared libraries: libGL.so.1: cannot open shared object file: No such file or directory

so I can not open none of these post processing softwares. what should I do? any suggestions are apreciated.