I'm receiving multiple errors from the version of PetTracker pushed through on 2/27/20:

Error #1:
12x Couldn't open PetTracker\addons\main\main.xml

Error #2:
6x Couldn't open PetTracker_Breeds\PetTracker_Breeds.toc

Error #3:
6x Couldn't open PetTracker_Switcher\PetTracker_Switcher.toc

Error #4:
3x Couldn't open PetTracker\addons\journal\journal.xml

Error #5:
30x ...dOns\PetTracker\addons\main\classes\abstract\pet-Pet.lua:154: Usage: GetPetInfoByID(petGUID)
[string "=[C]"]: in function GetPetInfoByPetID' [string "@PetTracker\addons\main\classes\abstract\pet-Pet.lua"]:154: in function GetSpecie'
[string "@PetTracker\addons\main\classes\abstract\pet-Pet.lua"]:93: in function GetAvailableBreeds' [string "@PetTracker\addons\journal\mods.lua"]:35: in function ModifyCard'
[string "@PetTracker\addons\journal\mods.lua"]:29: in function <PetTracker\addons\journal\mods.lua:29>
[string "=[C]"]: in function PetJournal_UpdatePetCard' [string "@Blizzard_Collections\Blizzard_PetCollection.lua"]:117: in function <...dOns\Blizzard_Collections\Blizzard_PetCollection.lua:114> [string "=[C]"]: ? [string "=[C]"]: ? [string "=[C]"]: in function SetShown'
[string "@Blizzard_Collections\Blizzard_Collections-1.0.lua"]:50: in function CollectionsJournal_UpdateSelectedTab' [string "@Blizzard_Collections\Blizzard_Collections-1.0.lua"]:6: in function CollectionsJournal_SetTab'
[string ":OnClick"]:1: in function <[string ":OnClick"]:1>

Locals:
(*temporary) = nil

Something wrong with your install