Custom Design Days

Can anyone familiar with custom design day files help?, I am new to ladybug and honeybee and would like to analyze the peak loads for the design day of different months. From what I understand you can just add the design day months along with the temps in the DDY file and pass that along in through the EnergySim parameter as shown below, however I am getting an error regarding running zone sizing? What steps am I missing? see below

I’m also attaching the modified ddy file,
Custom NY_New.York-LaGuardia.AP.ddy (8.1 KB)

thanks in advance for any insight on this

From what the error message says you need to set the run for sizing to True.