Try locating the problematic file by following the filepath that it's giving you in the error message. Once you find it delete the file then repair Apex Legends in Origin. If you right-click on the game in your Origin library you'll see the repair option when the menu comes up.
Let me know if that helps.
Error reading pak file "R:Vassets/promo/dl_pormo_2020_01_07.rpak" -- Error: Short read.
I get this message right after I load into the lobby of apex, and right after I load in, my game crashes and gives me this error code. what do I do
If you follow the file path in the error you're getting it should lead you to the specific .rpak file that's causing the error. Once you find it delete that file, then repair Apex Legends in Origin. See if that helps you get past the error that's been coming up.