I am using the plot to encounter the following problems, what should I do?

I am using the plot to encounter the following problems, what should I do?
the problems is fllowing:

plot(x,y)
ERROR: error compiling _do_plot_show: error compiling _display: could not load library "libGR.dll"
The specified module could not be found.

Stacktrace:
 [1] _plot!(::Plots.Plot{Plots.GRBackend}, ::Dict{Symbol,Any}, ::Tuple{Array{Int64,1},Array{Float64,1}}) at C:\Users\luk\.julia\v0.6\Plots\src\plot.jl:246
 [2] #plot#212(::Array{Any,1}, ::Function, ::Array{Int64,1}, ::Vararg{Any,N} where N) at C:\Users\luk\.julia\v0.6\Plots\src\plot.jl:58
 [3] plot(::Array{Int64,1}, ::Array{Float64,1}, ::Vararg{Array{Float64,1},N} where N) at C:\Users\luk\.julia\v0.6\Plots\src\plot.jl:52