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attempt to call method 'SetBackdropColor'
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This would mean you are calling frame:SetBackdropColor(...) on a frame that doesn't the mixin set. Maybe a frame created using CreateFrame() with a template that doesn't set a backdrop by default?
Or possibly inheriting a custom xml template that is still using the <Backdrop> </Backdrop> tags and not checking the mixin.
You could
Code:
if not frame.SetBackdropColor then
Mixin(frame, BackdropTemplateMixin)
end
Prikor to the call, but it seems you would be better figuring our where the backdrop is actually set in the first place and fixing that. Setting the colour of a non-existant backdrop doesn't seem very usefull
.