Abel

I have encountered the "INPUT DATA MUST INCLUDE AT LEAST ONE SYSTEM COMMAND"? message once and when I opened the .inp file there was basically nothing under the HVAC Systems / Zones??portion. I am still not sure what could have caused this but immediately prior to this I had experienced? multiple crashes while working on the geometry of a fairly complex model. Anyway all I did was copy in the system/zone info from a previous version of the inp file and with?a few ?minor adjustments in?zone names etc.?was able to recover my project without any loss.

I hope this is somewhat helpful

ronny