HFSS 3D polar plot does not show up

What could be the possible reason that the 3d Polar plot does not show up? my values for radiation sphere varies from 0 to 1800 nad for phi 0 to 360.

- Are there some error messages while simulating?
- Are you using variables? Then you could try to set all variables to "nominal"
- You can try to check if the solution is available by creating for example a data table with the gain.

Thanx for the suggestion. There was no error. and i used optmistation with the incrementing values of the variable. what do you mean by setting variable values to nominal value and how to do that?