No clue how this would have anything to do with TMW but that's the only add-on I see referenced in the error.

1x Usage: GameTooltip:SetHyperlink(link)
[C]: ?
[C]: ?
[C]: ?
[C]: ?
[C]: in function SetHyperlink' Blizzard_Communities\GuildNews.lua:160: in function CommunitiesGuildNewsButton_OnEnter'
[string ":OnEnter"]:2: in function <[string ":OnEnter"]:1>
[C]: in function Enable' Blizzard_Communities\GuildNews.lua:71: in function CommunitiesGuildNews_Update'
Blizzard_Communities\GuildNews.lua:13: in function update' SharedXML\HybridScrollFrame.lua:191: in function HybridScrollFrame_SetOffset'
SharedXML\HybridScrollFrame.lua:30: in function <SharedXML\HybridScrollFrame.lua:29>
[C]: in function `SetValue'
SharedXML\HybridScrollFrame.lua:67: in function <SharedXML\HybridScrollFrame.lua:57>

Locals:
(*temporary) = GameTooltip {
0 =
SetCurrencyByID = defined @AllTheThings\AllTheThings.lua:3181
ItemTooltip = {
}
SetCurrencyToken = defined @Altoholic\Tooltip.lua:700
SetGuildBankItem = defined =[C]:-1
SetVoidItem = defined =[C]:-1
SetVoidDepositItem = defined =[C]:-1
SetVoidWithdrawalItem = defined =[C]:-1
TMW_SetEquiv = defined @TellMEwhen\Options\TellMeWhen_Options.lua:165
comparing = false
SetSocketGem = defined =[C]:-1
SetLootItem = defined =[C]:-1
TopOverlay = {
}
TMW_SetDogTag = defined @TellMEwhen\Components\Core\Common\DogTags\config.lua:398
SetUnitDebuff = defined =[C]:-1
SetHeirloomByItemID = defined =[C]:-1
SetLFGDungeonReward = defined @AllTheThings\AllTheThings.lua:3218
SetQuestItem = defined =[C]:-1
Hide = defined =[C]:-1
SetTrainerService = defined =[C]:-1
SetToyByItemID = defined =[C]:-1
SetItemByID = defined =[C]:-1
SetExistingSocketGem = defined =[C]:-1
ttIcon = {
}
SetInboxItem = defined =[C]:-1
SetBuybackItem = defined =[C]:-1
shoppingTooltips =

{
}
SetUnitBuff = defined =[C]:-1
SetLFGDungeonShortageReward = defined @AllTheThings\AllTheThings.lua:3235
SetQuestLogItem = defined =[C]:-1
SetRecipeReagentItem = defined @Altoholic\Tooltip.lua:700
SetTradeTargetItem = defined =[C]:-1
SetHyperlink = defined =[C]:-1
SetTradePlayerItem = defined =[C]:-1
SetIconTextureAndText = defined @TipTacItemRef\ttItemRef.lua:62
SetSendMailItem = defined =[C]:-1
TMW_SetSpellByIDWithClassIcon = defined @TellMEwhen\Components\Core\Spells\ClassSpellCache.lua:212
updateTooltip = 0.086000
SetInventoryItem = defined =[C]:-1
Show = defined =[C]:-1
ttCount = {
}
SetLootRollItem = defined =[C]:-1
SetUnitAura = defined =[C]:-1
SetMerchantItem = defined =[C]:-1
SetAuctionSellItem = defined =[C]:-1
SetBagItem = defined =[C]:-1
needsReset = true
BottomOverlay = {
}
SetRecipeResultItem = defined =[C]:-1
TMW_SetFrameHighlight = defined @TellMEwhen\Components\GroupModules\GroupModule_GroupPosition\Config.lua:193
SetAuctionItem = defined =[C]:-1
}
(*temporary) = nil

You're right - totally unrelated to TMW.

TMW is mentioned because it adds methods to GameTooltip (you'll also see TipTac, Altoholic, and AllTheThings there as well). This is common for addons to do, and definitely isn't causing this.