"Error: Error setting design weather data." Does anyone know how to fix this?

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While Running Room Loads in IESVE the run stops and I encounter "Error: Error setting design weather data." Does anyone know how to fix this? I've tried reloading the weather files through the wizard. Old versions of the file used to work but ever since I made some changes in ApacheHVAC it won't run. I did look to see if this had been answered but didn't find anything. I am fairly new to energy modelling so apologies if this is obvious.