'VAV not recognized as All-Air System'

Hi Everyone!

I am currently analyzing a different mechanical systems per zone and have been successful up until running any of the VAV systems. An error comes up on the basis of “VAV not recognized as an All-Air System”. I am not sure why the error comes up since it is in the category of All-Air HVAC System but if anyone has any ideas, please let me know! I am currently running another model and will send a screenshot when possible.

Thank you!