Lua error on Login on sod 1.15.4

[mrbuds]

Describe the problem

with BasicChatMods v11.0.0

5x BasicChatMods/BasicConfig.lua:409: attempt to index global 'BCM_EditBoxScale_SliderHigh' (a nil value)
[string "@BasicChatMods/BasicConfig.lua"]:409: in function `?'
[string "@BasicChatMods/BasicCore.lua"]:119: in function `?'
[string "@BasicChatMods/BasicCore.lua"]:7: in function <BasicChatMods/BasicCore.lua:7>

Locals:
bcm = BCM {
 name = "BasicChatMods"
 settingsCategory = <table> {
 }
}
bcmTitle = FontString {
}
bcmDesc = FontString {
}
panelDesc = BCMPanelDesc {
}
enableBtn = BCMEnableButton {
 Text = BCMEnableButtonText {
 }
}
enableBtnText = FontString {
}
warn = BCM_Warning {
}
optionsWarn = BCM_OptionsWarn {
}
editBoxBGBtn = BCM_EditBoxBG_Button {
 Text = BCM_EditBoxBG_ButtonText {
 }
}
editBoxBGBtnText = FontString {
}
editBoxSlider = BCM_EditBoxScale_Slider {
}
(*temporary) = nil
(*temporary) = nil
(*temporary) = "OnValueChanged"
(*temporary) = nil
(*temporary) = "BCM_EditBoxScale_Slider"
(*temporary) = <table> {
 order = 38
 ID = 38
 parentCategory = <table> {
 }
 name = "Edit Box"
 subcategories = <table> {
 }
}
(*temporary) = nil
(*temporary) = true
(*temporary) = Frame {
 secureAttributeResults = <table> {
 }
}
(*temporary) = "register-category"
(*temporary) = "register-category"
(*temporary) = <table> {
 1 = <table> {
 }
 3 = true
}
(*temporary) = "attempt to index global 'BCM_EditBoxScale_SliderHigh' (a nil value)"
BCM = <table> {
 CHATLOG = "Always log chat."
 chatFuncs = <table> {
 }
 BCM_BNet = "Customize the brackets or add color to the various Real Id events such as whispers, conversations, and friends logging on."
 BCM_Sticky = "Customize your 'sticky' chat. Makes the chat edit box remember the last chat type you used so that you don't need to re-enter it again next time you chat."
 BCM_Fade = "Fade out the chat frames completely instead of partially when moving your mouse away from a chat frame."
 TOP = "Top"
 BCM_AutoLog = "Automatically log chat after logging on and automatically log the combat log when in a raid instance."
 GUILDRECRUIT = "GuildRecruitment"
 BOTTOM = "Bottom"
 BCM_Font = "Change the font name, size, and style of your chat frames & edit box."
 SHOWLEVELS = "Player level next to name."
 COMBATLOG = "Log combat in a raid instance."
 BCM_EditBox = "Customize the Edit Box (the box you type in) like moving it to the top, hiding the background, and increasing the size."
 info = <table> {
 }
 PLAYERBRACKETS = "Player Brackets:"
 RIGHT = "Right"
 OPTIONS = "<<More options may be available after enabling this module>>"
 CUSTOMCHANNEL = "Custom Channel"
 CHANNELNUMBER = "Channel Number"
 Events = Frame {
 }
 modules = <table> {
 }
 chatFrames = 10
 chatFuncsPerFrame = <table> {
 }
 chatFrameRefs = <table> {
 }
 protectedText = "<Protected Text>"
 BCM_Resize = "Allows you to change the size of the chat frame to sizes smaller/bigger than what Blizz allows."
 CLICKTOCOPY = "Shift-click to copy chat."
 COLORMISC = "Class color friend/guild logon."
 LOCALDEFENSE = "LocalDefense"
 BCM_Timestamp = "Customize the timestamps you want your chat to use. Choose a color or no color at all, then choose the exact format of the timestamp."
 BCM_ButtonHide = "Completely hides the chat frame side buttons from view for the people that have no use for them."
 BCM_History = "Choose how many lines of chat history your chat frames remember."
 TRADE = "Trade"
 LFG = "LookingForGroup"
 BCM_ScrollDown = "Create a small clickable arrow over your chat frames that flashes if you're not at the very bottom."
 WORLDDEFENSE = "WorldDefense"
 TRADE_SERVICES = "Trade (Services)"
 BCM_TellTarget = "Allows you to whisper/tell your current target with the command /tt message or /wt message."
 BCM_PlayerNames = "Customize the player name in chat with player level/group (if known) or remove/change brackets. E.g. [85:|cFFFFFFFFCoolPriest|r:5]"
 CENTER = "Center"
 GENERAL = "General"
 LEFT = "Left"
 BCM_ChannelNames = "Selectively replace the channel names with custom names of your liking. E.g. [Party] >> [P]"
 BCM_ChatCopy = "This module allows you to copy chat directly from your chat frame by |cFFFFFFFFSHIFT-clicking|r the chat frame tab."
 BCM_Highlight = "Play a sound if your name is mentioned in chat, also class color it. You can enter the short version of your name in the box below."
 BCM_URLCopy = "Turn websites in your chat frame into clickable links for you to easily copy. E.g. |cFFFFFFFF[www.battle.net]|r"
 BCM_GMOTD = "Re-display the 

if i comment these lines and the 2 next, i get an other error with BCM_FontSizeHigh line 527

I also have this error which may be related to a broken xml template

10x Blizzard_FrameXML/DeprecatedTemplates.xml:37 Couldn't find inherited node: UISliderTemplateWithLabels

[mrbuds]

Indeed

local editBoxSlider = CreateFrame("Slider", "BCM_EditBoxScale_Slider", BCM_EditBox, "OptionsSliderTemplate")

and

local fontSizeSlider = CreateFrame("Slider", "BCM_FontSize", BCM_Font, "OptionsSliderTemplate")

    <Slider name="OptionsSliderTemplate" inherits="UISliderTemplateWithLabels" virtual="true">
        <Size x="144" y="17"/>
    </Slider>

UISliderTemplateWithLabels is defined in SliderTemplates.xml which is missing in Blizzard_SharedXML_Vanilla.toc

[funkydude]

No real plans to address this: https://github.com/Stanzilla/WoWUIBugs/issues/645

[funkydude]

Made it so that it doesn't brick the whole addon.