A lot of errors keep popping up "MultiBarBottomLeftButton1" and index field '?'

[Tiiara]

3x [ADDON_ACTION_BLOCKED] AddOn 'ItemLevelDisplay' tried to call the protected function 'MultiBarBottomLeftButton1:SetShown()'.
[string "@!BugGrabber/BugGrabber.lua"]:485: in function <!BugGrabber/BugGrabber.lua:485>
[string "=[C]"]: in function `SetShown'
[string "@Blizzard_ActionBar/Mainline/ActionBar.lua"]:206: in function `UpdateShownButtons'
[string "@Blizzard_ActionBar/Mainline/ActionButton.lua"]:510: in function `UpdateAction'
[string "@Blizzard_ActionBar/Mainline/ActionButton.lua"]:987: in function `OnEvent'
[string "@Blizzard_ActionBar/Mainline/ActionButton.lua"]:207: in function <Blizzard_ActionBar/Mainline/ActionButton.lua:204>

14x ItemLevelDisplay/ItemLevelDisplay.lua:652: attempt to index field '?' (a nil value)
[string "@ItemLevelDisplay/ItemLevelDisplay.lua"]:652: in function <ItemLevelDisplay/ItemLevelDisplay.lua:622>
[string "=(tail call)"]: ?
[string "=[C]"]: in function `EquipmentFlyout_DisplayButton'
[string "@Blizzard_FrameXML/EquipmentFlyout.lua"]:315: in function `EquipmentFlyout_UpdateItems'
[string "@Blizzard_FrameXML/EquipmentFlyout.lua"]:231: in function `EquipmentFlyout_Show'
[string "@Outfitter/OutfitterQuickSlots.lua"]:49: in function `PostClick'
[string "@Outfitter/OutfitterQuickSlots.lua"]:10: in function <Outfitter/OutfitterQuickSlots.lua:10>

52x ItemLevelDisplay/ItemLevelDisplay.lua:629: attempt to index field '?' (a nil value)
[string "@ItemLevelDisplay/ItemLevelDisplay.lua"]:629: in function <ItemLevelDisplay/ItemLevelDisplay.lua:622>
[string "=(tail call)"]: ?
[string "=[C]"]: in function `EquipmentFlyout_DisplayButton'
[string "@Blizzard_FrameXML/EquipmentFlyout.lua"]:315: in function `EquipmentFlyout_UpdateItems'
[string "@Blizzard_FrameXML/EquipmentFlyout.lua"]:231: in function `EquipmentFlyout_Show'
[string "@Outfitter/OutfitterQuickSlots.lua"]:49: in function `PostClick'
[string "@Outfitter/OutfitterQuickSlots.lua"]:10: in function <Outfitter/OutfitterQuickSlots.lua:10>