CIBSE heat gain calculation

Question

I need to calculate heat gains for individual zones of the building however when I click the room selection button the following error appears. 
 
 The program will provide CIBSE heat gains for every room on in the project

Shane Regan · Answer

Hello Steve, 
 Apologies the above seems to have been missed as it was posted to the Hevacomp forum - for Energy Simulator queries please use the Energy Simulation forum here. 
 In relation to your question; we have requested that development enable the room selection prior to the calculation running. At the moment the calculation will commence upon opening CIBSE gain however you can select individual rooms thereafter as below:

If you require assistance with the unhandled exception error please let me know and I can obtain your project.