I get this error each time I load into the game

Date: 2023-10-14 17:47:45
ID: 1
Error occured in: Global
Count: 1
Message: Interface/AddOns/ZPerl_Target/ZPerl_Target.lua line 1544:
attempt to call global 'UnitIsBattlePet' (a nil value)
Debug:
[string "@Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua"]:146:
...tCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:144
[string "=[C]"]: UnitIsBattlePet()
[string "@Interface/AddOns/ZPerl_Target/ZPerl_Target.lua"]:1544: func()
[string "@Interface/AddOns/ZPerl_Target/ZPerl_Target.lua"]:1301:
Interface/AddOns/ZPerl_Target/ZPerl_Target.lua:1299
Locals:
private =

{
ThrowError = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:46
DoesErrorExist = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:87
ClearOldErrors = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:107
SanitizeLine = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:83
MAX_STACK_DEPTH = 10
log = {
}
ErrorHandler = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:116
IncrementErrorCount = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:77
NewError = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:50
IsRCLootCouncilError = defined @Interface/AddOns/RCLootCouncil_Classic/RCLootCouncil/Core/ErrorHandler.lua:94
}
orig_errorhandler = defined @Interface/AddOns/Decursive/Dcr_DIAG.lua:637