Sloped curtainwall system

[Crystal Harpell]

I am trying to model a sloped curtainwall system - it is roughly 65 feet long and consists of two rows if IG's mounted to an aluminum curtainwall frame.  As per the Sim manual I planned on modeling the system as a sloped glazing using centerline dimensions.  The left and right jamb models ran fine, and the head model also ran fine.  The half-frame sill, however, initially seems to run, draws isotherms on the model, and then throws an error that reads:

"Actual cavity height is smaller than the modeled cavity in ConRad".

Model results aren't available for viewing.  I've double checked the Simulation options and I believe everything is set properly.

I haven't been able to find any reference to this error ... does anybody have a suggestion as to what I've done wrong?

[bga...]

Hello All,

I'm working on simulating a parapet frame detail in THERM 7.7.7.0 and am getting the same error. I was wondering if you found a solution to this issue? 

Any assistance would be appreciated!