What version of the game you are experiencing the issue with:
Live/Retail, TBC, Classic
WOTLK Classic

Describe the bug
A clear and concise description of what the bug is.
Name plates no longer show above enemies.

To Reproduce
Steps to reproduce the behavior:

1. Right click on any merchant
2. Error message pops up for the addon
3. Walk up to any mob in the wild
4. Name plates are missing, but it does show if they are part of a kill/loot quest still
5. Error is as follows:
6. Date: 2022-09-02 15:34:04
   ID: 22
   Error occured in: Global
   Count: 1
   Message: ..\AddOns\NeatPlates\NeatPlatesCore.lua line 1622:
   attempt to call method 'CreateTargetFrame' (a nil value)
   Debug:
   [string "@NeatPlates\NeatPlatesCore.lua"]:1622:
   NeatPlates\NeatPlatesCore.lua:1616
   [string "@NeatPlates\NeatPlatesCore.lua"]:1633: ?()
   [string "@NeatPlates\NeatPlatesCore.lua"]:1557:
   NeatPlates\NeatPlatesCore.lua:1555
   [string "=[C]"]: TurnOrActionStop()
   [string "TURNORACTION"]:4:
   [string "TURNORACTION"]:1
   Locals:
   unitAlive = true
   guid = "Creature-0-4392-0-115-1678-0000121376"
   (*temporary) = nil
   (*temporary) = {
   IsFriend = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:28
   GetTotemOwner = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:280
   EnableHealerTrack = defined @interface\AddOns\NeatPlatesWidgets\HealerTrack.lua:332
   fade = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:170
   IsTotem = defined @interface\AddOns\NeatPlatesWidgets\TotemIconWidget.lua:128
   GetNumRaidMembers = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:38
   GetUnitQuestInfo = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:315
   GetNumPartyMembers = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:44
   GetUnitSubtitle = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:218
   round = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:165
   IsHealer = defined @interface\AddOns\NeatPlatesWidgets\HealerTrack.lua:16
   DisableHealerTrack = defined @interface\AddOns\NeatPlatesWidgets\HealerTrack.lua:341
   GetFriendlyThreat = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:402
   RGBToHex = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:137
   GetRelativeThreat = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:526
   IsPartyMember = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:33
   abbrevNumber = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:111
   copyTable = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:10
   HexToRGB = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:120
   GetGroupInfo = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:58
   GetSpec = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:50
   ParseGUID = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:184
   Colors = {
   }
   GetArenaIndex = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:380
   IsGuildmate = defined =[C]:-1
   mergeTable = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:75
   updateTable = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:92
   GetPetOwner = defined @interface\AddOns\NeatPlates\NeatPlatesUtility.lua:268
   }
   (*temporary) = "attempt to call method 'CreateTargetFrame' (a nil value)"
   HasTarget = true
   NeatPlatesTarget = nil
   OnNewNameplate = defined @interface\AddOns\NeatPlates\NeatPlatesCore.lua:421
   toggleNeatPlatesTarget = defined @interface\AddOns\NeatPlates\NeatPlatesCore.lua:232
   PlatesByGUID = {
   }
   SetUpdateAll = defined @interface\AddOns\NeatPlates\NeatPlatesCore.lua:196

   Expected behavior
   A clear and concise description of what you expected to happen.
   Name plates to be visible above allies/enemies

   Screenshots
   If applicable, add screenshots to help explain your problem.
   

   Additional context
   Add any other context about the problem here.

Also not seeing the nameplates after the latest update. I even rolled back to to 413 and still are having the same issue so I suspect its due to a version change with the client or something.

i was in AV, and a fast disconect ocurres me, when i log in other time my neat plates have disapear like in image of our mate..... :(
i have a neat plates addon installed in curseforge but not apear in Addons in game

<3 Blizzard
Today they published the proper UI update for wrath.

NeatPlates\NeatPlatesGlobals.lua - Change Line 1 to:
NEATPLATES_IS_CLASSIC_WOTLKC = WOW_PROJECT_ID == WOW_PROJECT_WRATH_CLASSIC -- Might get changed once actual release happens

LibRangeCheck also needs to be updated....

That did it!

For the less technically inclined, LibRangeCheck is in:

NeatPlates\libs\LibRangeCheck-2.0

on line 51 change:
local IsClassic = (WOW_PROJECT_ID == WOW_PROJECT_CLASSIC) or (WOW_PROJECT_ID == WOW_PROJECT_BURNING_CRUSADE_CLASSIC)

to:
local IsClassic = (WOW_PROJECT_ID == WOW_PROJECT_CLASSIC) or (WOW_PROJECT_ID == WOW_PROJECT_WRATH_CLASSIC)

I've changed the LibRangeCheck on a fresh install, and it still doesn't work for me

I've changed the LibRangeCheck on a fresh install, and it still doesn't work for me

You will need to change the main NeatPlatesGlobals.lua as well as Orionshock noted above

ive changed both of the files and its still not working for me

Thanks worked for me now.
Try manually deleting the files, then fresh installing.

Do you mind elaborating on the steps you took to fix it? I changed the lines and did multiple fresh installs and all it managed to do was make the settings available in game. It still doesnt load the nameplates though.

Do you mind elaborating on the steps you took to fix it? I changed the lines and did multiple fresh installs and all it managed to do was make the settings available in game. It still doesnt load the nameplates though.

Go to your addon folder and follow the steps below:

NeatPlates\libs\LibRangeCheck-2.0

on line 51 change:
local IsClassic = (WOW_PROJECT_ID == WOW_PROJECT_CLASSIC) or (WOW_PROJECT_ID == WOW_PROJECT_BURNING_CRUSADE_CLASSIC)

to:
local IsClassic = (WOW_PROJECT_ID == WOW_PROJECT_CLASSIC) or (WOW_PROJECT_ID == WOW_PROJECT_WRATH_CLASSIC)

then go to to NeatPlates/NeatPlatesGlobals

Change Line 1 to:
NEATPLATES_IS_CLASSIC_WOTLKC = WOW_PROJECT_ID == WOW_PROJECT_WRATH_CLASSIC -- Might get changed once actual release happens

Seems Blizzard decided to hotfix in the correct project id while I was asleep, the latest should fix that issue.

Not sure if the range library has been updated to reflect this as well now, but I wasn't getting any errors while I was trying it out. But an updated version might be provided by another addon.

So if anyone is still having issues with the range library after the latest update I guess I'll have to included it directly instead of at the build stage until it gets updated.