[xConStruct]

@theiven:

    t:SetFilter(cB_Filters.fBank, true)
    t:SetFilter(cB_Filters.fBankFilter, true)
    t:setFilter(cB_Filters.fMining, true)     -- this is line #86
    cB_Bags.bankMining = t

Typo: You spelled the last function with a small 's' instead of a capital 'S'. That's also the cause of the error message.

@Quokka:

bankToggle:SetScript("OnClick", function(self)
    ToggleFrame(cB_Gnomed_Bank)
    ToggleFrame(cB_Gnomed_Bank-Gear)
    ToggleFrame(cB_Gnomed_Bank-Cons)
end)

You need to add the ToggleFrame-function before each bag frame.