Im trying to plot the following using layers...though do I have to load it 
separately or why doesnt it work?

julia> plotcomb=plot(
       layer(
       x=Q_l,
       y=cal_corr
       ),
       layer(
       x=Q_l,
       y=cal_corr,
       Geom.line
       ),
       Theme(panel_opacity=0.1)
       )
Error showing value of type Gadfly.Plot:
ERROR: MethodError: `render` has no method matching 
render(::Gadfly.Geom.Nil, ::Gadfly.Theme, ::Gadfly.Aesthetics)
Closest candidates are:
  render(::Gadfly.Geom.Nil, ::Gadfly.Theme, ::Gadfly.Aesthetics, 
::Gadfly.Data, ::Dict{Symbol,Gadfly.ScaleElement}, 
::Array{Gadfly.Aesthetics,1})
  render(::Gadfly.GeometryElement, ::Gadfly.Theme, ::Gadfly.Aesthetics, 
::Union{Array{Gadfly.Aesthetics,1},Void}, 
::Union{Array{Gadfly.Data,1},Void}, ::Dict{Symbol,Gadfly.ScaleElement})
  render(::Gadfly.Geom.BarGeometry, ::Gadfly.Theme, ::Gadfly.Aesthetics)
  ...
 in render at C:\cygwin64\home\Diger\.julia\v0.4\Gadfly\src\geometry.jl:47
 in render_prepared at 
C:\cygwin64\home\Diger\.julia\v0.4\Gadfly\src\Gadfly.jl:782
 in render at C:\cygwin64\home\Diger\.julia\v0.4\Gadfly\src\Gadfly.jl:721
 in display at C:\cygwin64\home\Diger\.julia\v0.4\Gadfly\src\Gadfly.jl:973
 [inlined code] from multimedia.jl:151
 in display at C:\cygwin64\home\Diger\.julia\v0.4\Gadfly\src\Gadfly.jl:151
 in print_response at REPL.jl:134
 in print_response at REPL.jl:121
 in anonymous at REPL.jl:624
 in run_interface at LineEdit.jl:1610
 in run_frontend at REPL.jl:863
 in run_repl at REPL.jl:167
 in _start at client.jl:453

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