i designed simple system "ideal air load" with open studio however received fatal error during simulation. then i exported the same system as idf and run through energyplus,it worked properly. Any idea why this happens

i designed simple system "ideal air load" with open studio however received fatal error during simulation. then i exported the same system as idf and run through energyplus,it worked properly. Any idea why this happens

i designed simple system "ideal air load" with open studio however received fatal error during simulation. then i exported the same system as idf and run through energyplus,it worked properly. Any idea why this happens