I suspect the convert bug, which you can find in multiple instances by 
searching the issues. Try pinning the Color package at v0.3.9 or v0.3.6 and 
see if this works around the bug.

--Tim

On Monday, November 03, 2014 04:48:13 PM K Leo wrote:
> I have a small program that uses DataFrames to read in a file, does some
> simple computation and then plots some variables using Winston.  I run
> it with the following:
> 
> julia> include("PlotBasics.jl")
> PlotBasics (generic function with 1 method)
> 
> julia> PlotBasics()
> 
> It runs fine the first time, but if I change the variables for plot and
> run it the second time, I got the following errors now (it used to run
> perfectly before).  If I restart julia and run it again, it runs fine
> the first time.
> 
> julia> PlotBasics()
> ERROR: `convert` has no method matching
> convert(::Type{Array{Float64,N}}, ::Array{Int64,1})
>   in convert at base.jl:13
>   in builddf at /home/xxx/.julia/DataFrames/src/dataframe/io.jl:583
>   in readtable! at /home/xxx/.julia/DataFrames/src/dataframe/io.jl:783
>   in readtable at /home/xxx/.julia/DataFrames/src/dataframe/io.jl:868
>   in readtable at /home/xxx/.julia/DataFrames/src/dataframe/io.jl:935
> 
>     _       _ _(_)_     |  A fresh approach to technical computing
>    (_)     | (_) (_)    |  Documentation: http://docs.julialang.org
>     _ _   _| |_  __ _   |  Type "help()" for help.
> 
>    | | | | | | |/ _` |  |
>    | | |
>    | | |_| | | | (_| |  |  Version 0.3.2 (2014-10-21 20:18 UTC)
> 
>   _/ |\__'_|_|_|\__'_|  |  Official http://julialang.org release
> 
> |__/                   |  x86_64-linux-gnu

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