SixUI   

function M.FormatKeyValueText(k, v)
    -- Provide default value for k if it is nil
    k = k or "Unknown Key"
    return format(L["%s %s"], NORMAL_FONT_COLOR:WrapTextInColorCode(k .. ":"), HIGHLIGHT_FONT_COLOR:WrapTextInColorCode(v))
end

1x SixUI_Config/Module/Setup.lua:16: attempt to concatenate local 'k' (a nil value)
[string "@SixUI_Config/Module/Setup.lua"]:16: in function `FormatKeyValueText'
[string "@SixUI_Config/Module/Setup.lua"]:122: in function `GenerateMigrationOptionsTable'
[string "@SixUI_Config/Module/Setup.lua"]:106: in function <SixUI_Config/Module/Setup.lua:56>
[string "@ErrorFilter/Libs/AceConfig-3.0-3/AceConfigRegistry-3.0-21/AceConfigRegistry-3.0.lua"]:334: in function `app'
[string "@ErrorFilter/Libs/AceConfig-3.0-3/AceConfigDialog-3.0-87/AceConfigDialog-3.0.lua"]:1857: in function `Open'
[string "@SixUI_Config/Module/Setup.lua"]:165: in function `ToggleSetupFrame'
[string "@SixUI_Config/Module/Setup.lua"]:180: in function `?'
[string "@BigWigs/Libs/CallbackHandler-1.0-8/CallbackHandler-1.0.lua"]:109: in function <...igs/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:109>
[string "=[C]"]: ?
[string "@BigWigs/Libs/CallbackHandler-1.0-8/CallbackHandler-1.0.lua"]:19: in function <...igs/Libs/CallbackHandler-1.0/CallbackHandler-1.0.lua:15>
[string "@BigWigs/Libs/CallbackHandler-1.0-8/CallbackHandler-1.0.lua"]:54: in function `Fire'
[string "@ErrorFilter/Libs/AceEvent-3.0-4/AceEvent-3.0.lua"]:120: in function <...ddOns/ErrorFilter/Libs/AceEvent-3.0/AceEvent-3.0.lua:119>

Locals:
k = nil
v = "N/A"
(*temporary) = "%s %s"
(*temporary) = <table> {
 a = 1
 b = 0
 g = 0.823529
 r = 1
}
(*temporary) = nil
(*temporary) = ":"
(*temporary) = "attempt to concatenate local 'k' (a nil value)"
L = <table> {
 Options for SixUI's displays. = "Options for SixUI's displays."
 Set action bar toggles = "Set action bar toggles"
 Hide by Default = "Hide by Default"
 Top Left = "Top Left"
 SixUI help: = "SixUI help:"
 Watch = "Watch"
 Damage = "Damage"
 Zoom = "Zoom"
 Standard = "Standard"
 layout = "layout"
 Welcome to SixUI version %s. = "Welcome to SixUI version %s."
 Reputations = "Reputations"
 In a Queue = "In a Queue"
 Shortcuts = "Shortcuts"
 Skins tooltips. = "Skins tooltips."
 Use the clutter key to reload SUF's tags, ensuring any dynamic tags are updated. = "Use the clutter key to reload SUF's tags, ensuring any dynamic tags are updated."
 Clutter = "Clutter"
 Shared Media Fonts (Requires Reload) = "Shared Media Fonts (Requires Reload)"
 Show Scroll Indicator = "Show Scroll Indicator"
 Show Macro Text = "Show Macro Text"
 Heading text font size. Default: 14. = "Heading text font size. Default: 14."
 Show progress bars instead of text. When text is hidden, hold the clutter key to show it. = "Show progress bars instead of text. When text is hidden, hold the clutter key to show it."
 Nothing 2 = "Nothing 2"
 Attributes = "Attributes"
 Active Layout = "Active Layout"
 Disable Animations = "Disable Animations"
 Restore Messages = "Restore Messages"
 Heading = "Heading"
 Sets the growth direction for multi-row horizontal action bars. = "Sets the growth direction for multi-row horizontal action bars."
 Accept Ready Checks = "Accept Ready Checks"
 Reactions = "Reactions"
 Control when Skada's percent columns are shown. = "Control when Skada's percent columns are shown."
 Y Offset = "Y Offset"
 Font = "Font"
 Display = "Display"
 Percent = "Percent"
 None = "None"
 open SixUI's interface options. = "open SixUI's interface options."
 Silver = "Silver"
 Glyph Color = "Glyph Color"
 Click on a faction's name in a reputation message to enable its 'Show as Experience Bar' option. = "Click on a faction's name in a reputation message to enable its 'Show as Experience Bar' option."
 [RW] %1  = "[RW] %1 "
 [S] %1  = "[S] %1 "
 Suffix = "Suffix"
 Control the Objective Tracker's visibility using macro conditionals. = "Control the Objective Tracker's visibility using macro conditionals."
 Options for SixUI's raid frames. = "Options for SixUI's raid frames."
 Show Artwork = "Show Artwork"
 Use Alt. Raid Icons = "Use Alt. Raid Icons"
 Colors = "Colors"
 Auto-accept group invitations from guild members. = "Auto-accept group invitations from guild members."
 Control Panel Position = "Control Panel Position"
 Repair = "Repair"
 Delete an entry from the ignore list. = "Delete an entry from the ignore list."
 Auto-accept group invitations from the last character you whispered. = "Auto-accept group invitations from the last character you whispered."
 Order = "Order"
 You do not have enough gold for repairs. = "You do not have enough gold for repairs."
 Accept Quests = "Accept Quests"
 Skins icons and progress bars. = "Skins icons and progress bars."
 I = "I"
 Shift = "Shift"
 Zone Ability Frame = "Zone Ability Frame"
 O = "O"
 Use High-Quality Icons = "Use High-Quality Icons"
 P = "P"
 R = "R"
 Skin Frame = "Skin Frame"
 Tooltip = "Tooltip"
 Nothing 1 = "Nothing 1"
 Outdated = "Outdated"
 Instance Info = "Instance Info"
 Auto-thanks the player who resurrected you. = "Auto-thanks the player who resurrected you."
 Alt = "Alt"
 Add an aura to the ignore list to disable skinning for it. = "Add an aura to the ignore list to disable skinning for it."
 %s / %s (%s%%) = "%s / %s (%s%%)"
 Control when Skada's damage and healing columns are shown. = "Control when Skada's damage and healing columns are shown."
 Control Grid2's button size. = "Control Grid2's button size."
 The layout '%s' is already active. = "The layout '%s' is already active."
 Use SixUI's raid frame options to adjust Grid2 as your group size changes. = "Use SixUI's raid frame