plot in Paraview deappear
 

I have tried to follow the tutorial (README file with ParaFOAM)
after making the 'icoFoam'-command i have tried the paraFoam-command but following error:

created temporary 'cavity.OpenFOAM'
/home/daniel/OpenFOAM/ThirdParty-1.6/paraview-3.6.1/platforms/linuxGcc/bin/paraview-real: error while loading shared libraries: libQtAssistantClient.so.4: cannot open shared object file: No such file or directory
daniel@dn-laptop:~/OpenFOAM/daniel-1.6/run/tutorials/incompressible/icoFoam/cavity$

I have tried to convert to VTK with foamToVTK
I can then open the 'cavity'-file in paraview, but when I press the play botton, I can se the correct plot for milliseconds and then it desappears.
Can anyone help.

just a guess but did you install Qt?