Hi,

I got an error when using the parameter Theme with Gadfly, so I tried using 
an example from http://gadflyjl.org/themes.html#examples (see below).

When I run the example from the website below, I get an error saying 
'convert' has no method matching 
convert(::Type{Union(Nothing,AlphaColorValue{C<:ColorValue{T},T<:Union(FloatingPoint,FixedPoint)},ColorValue{T})},::RGB{UfixedBase{UInt8,8}}).
 
I don't understand what I am doing wrong here when using the example from 
Gadfly. Any idea? Thanks

plot(x=rand(10), y=rand(10),
     Theme(panel_fill=colorant"black", default_color=colorant"orange"))

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