I took my P4P out of the case today after about 6 months. Charged up the batteries and got the error message

Air encoder error

PLEASE HELP! Also tried to connect to Assistant 2 Phantom, not compatable with OSX Catalina. Recieved the FIX, still cannot connect.

PLEASE HELP!

Hello and good day Bernie UK. I am sorry to know that you are having this issue on your DJI Phantom 4 Pro. Can you please try to restore the factory defaults and refresh firmware of the said drone using DJI Assistant 2 to see if the issue will still persist. Please keep us posted on the said matter for further assistance. Thank you.