This error appears every time you open it, and then the mounts icon will turn into all black...
1x MCL/functions.lua:1009: bad argument #1 to 'pairs' (table expected, got nil) [string "=[C]"]: in function pairs'
[string "@MCL/functions.lua"]:1009: in function UpdateCollection' [string "@MCL/main.lua"]:68: in function Toggle'
[string "@MCL/functions.lua"]:1149: in function OnClick' [string "@!Ace3/LibDBIcon-1.0-45/LibDBIcon-1.0.lua"]:144: in function oclick'
[string "@MBB/MBB.lua"]:434: in function <MBB/MBB.lua:422>

Locals:
(*temporary) = nil
(*temporary) = "table expected, got nil"
= defined =[C]:-1
`

If you use /mcl to open, the following two errors will occur:
1x MCL/functions.lua:1009: bad argument #1 to 'pairs' (table expected, got nil) [string "=[C]"]: in function pairs'
[string "@MCL/functions.lua"]:1009: in function UpdateCollection' [string "@MCL/main.lua"]:68: in function Toggle'
[string "@MCL/Core.lua"]:17: in function ?' [string "@FrameXML/ChatFrame.lua"]:5224: in function ChatEdit_ParseText'
[string "@FrameXML/ChatFrame.lua"]:4888: in function ChatEdit_SendText' [string "@FrameXML/ChatFrame.lua"]:4924: in function ChatEdit_OnEnterPressed'
[string "*ChatFrame.xml:127_OnEnterPressed"]:1: in function <[string "*ChatFrame.xml:127_OnEnterPressed"]:1>

Locals:
(*temporary) = nil
(*temporary) = "table expected, got nil"
= defined =[C]:-1
2x MCL/functions.lua:808: bad argument #2 to 'format' (string expected, got nil)
[string "=[C]"]: in function `format'
[string "@MCL/functions.lua"]:808: in function <MCL/functions.lua:806>

Locals:
(*temporary) = "%s/%s"
(*temporary) = nil
(*temporary) = nil
(*temporary) = "string expected, got nil"
`