trouble with squeezing mesh
 

Hi there,
I'm handling a squeezing mesh operation and I have trouble,
deltay is a volscalarfield which stands for the hight of each cells and it is temperature dependent variable;
as it is into the pointdisplacementy file, it should be converted into a pointscalarfield through volpointinterpolation then I have deltayp.
Here is what I implemented into the pointdisplacementy file:
Internalfield
{
deltayp.internalField();
}
boundary
{
deltayp.boundaryField();
}
The code runs well but when I display parafoam
It gives an error!!!!What should I do?I'm completely lost!
Please can you help me out?
Best Regards