[Phanx]

oUF expects each of your class icon objects to be a texture. If you aren't using any statusbar features (eg. displaying a value within a range) you should just make your objects textures instead of statusbars. They will look the same, but (a) not defy oUF's expectations and (b) use less memory.

--: CLASSICON :--
if cClassIcn == true then
	self.ClassIcons = CreateFrame("Frame", nil, self)
	self.ClassIcons:SetPoint("BOTTOMRIGHT", self.Health, "BOTTOMRIGHT", -3, 3)
	self.ClassIcons:SetHeight(10)
	self.ClassIcons:SetWidth(150)
	for i = 1, 5 do
		self.ClassIcons[i] = self:CreateTexture(nil, "ARTWORK")
		self.ClassIcons[i]:SetTexture(statusbar)
		self.ClassIcons[i]:SetHeight(10)
		self.ClassIcons[i]:SetWidth((150-4)/5)
		if i == 1 then
			self.ClassIcons[i]:SetPoint("BOTTOMRIGHT", self.Health, "TOPRIGHT", 0, 5)
		else
			self.ClassIcons[i]:SetPoint("RIGHT", self.ClassIcons[i-1], "LEFT", -1, 0)
		end
	end
end

If you are using :SetValue or other statusbar features, you can just add a dummy function under the "UpdateTexture" key for each class icon (see line 73 in oUF/elements/classicons.lua):

local DoNothing = function() return end

--: CLASSICON :--
if cClassIcn == true then
	self.ClassIcons = CreateFrame("Frame", nil, self)
	self.ClassIcons:SetPoint("BOTTOMRIGHT", self.Health, "BOTTOMRIGHT", -3, 3)
	self.ClassIcons:SetHeight(10)
	self.ClassIcons:SetWidth(150)
	for i = 1, 5 do
		self.ClassIcons[i] = CreateFrame("StatusBar", nil, self)
		self.ClassIcons[i].UpdateTexture = DoNothing
		...

(Also, please use CODE tags around your code, not QUOTE tags; the latter discards your indents, making your code really hard to read.)