As is known, PopcornFX was updated in 1.33, but not all assets currently in the game files are compatible.
This is a list of some pkb files that the WE tries to load, but don’t load in 19019:
(of course, these are all in the HD part of the game data, as PopcornFX is HD-exclusive)
SharedFX/HumanBuildingBirth_Small/HumanBuildingBirth_Small.pkb
Units/Undead/Shade/ShadeDeath.pkb
Buildings/Naga/SpawningGrounds/SG_Work.pkb
Units/NightElf/Vengeance/VengeanceDeath.pkb
SharedFX/OgreCastFX/AttackSlam.pkb
Units/Orc/Tauren/Tauren_Blood.pkb
Abilities/Spells/Other/Tornado/TornadoElemental.pkb
Buildings/Orc/TaurenTotem/TT_Work.pkb
SharedFX/DustTrail/DustTrail.pkb
SharedFX/DemonDeath/DemonDeath.pkb
SharedFX/WoodExplosionOmni_Small/WoodExplosionOmni_Small.pkb
SharedFX/HUBuildingDeath_Small/HUBuildingDeath_Small.pkb
Units/Creeps/BansheeWraith/BansheeWraithDeath.pkb
SharedFX/Phoenix/PhoenixEgg.pkb
SharedFX/Ship_Wake_Small/Ship_Wake_Small.pkb
I hope there’s a simple way for you to test all pkb files, or just regenerate them all, because trying to comb through these is not easy for either side. The error mentions rebaking them, so likely good to do