CFD Simulation

Hi, I have to solve a problem when I work with the Fluid Scenario Creation App. Sometimes it happens that when it finish to simulate I can't plot the result, but I only see and choose by the menu the "Undeformed Model" without any color and not for example the Gauge Pressure or Velocity plot. If I create a new Contour Plot, it shows me only the Plot Density. I'm sure that i setup all well, because while simulation is loading the plot and the steady-step is right and without any errors. Can you help me please? Thanks