failed to evaluate variables

Hi ,

I am building a 3d model of fluid flowing around a wafer using 4.3a. The following error occured when I tried to plot the pressure on the edge of the wafer.




Cannot ecaluate expression.

Failed to evaluate variable.
- Variable: mod1.p
- Geometry: 1
- Domain: 5

Failed to evaluate expression.
- Expression: mod1. p
- plot: lngr3(line graph)

Domain 5 is the wafer in my geometry. Can anybody help me out please?