Documenter.jl error after using StatsPlots

I have the error afet using StatsPlots:

/home/runner/.julia/packages/GR/G9I5v/src/../deps/gr/bin/gksqt: error while loading shared libraries: cannot open shared object file: No such file or directory
connect: Connection refused
GKS: can't connect to GKS socket application

GKS: Open failed in routine OPEN_WS
GKS: GKS not in proper state. GKS must be either in the state WSOP or WSAC in routine ACTIVATE_WS


@example lmmexample
using Metida, StatsPlots, CSV, DataFrames, MixedModels;

rds = CSV.File(joinpath(dirname(pathof(Metida)), "..", "test", "csv",  "1fptime.csv"); types = [String, String, Float64, Float64]) |> DataFrame

p = @df rds plot(:time, :response, group = (:subject, :factor), colour = [:red :blue], legend = false); # hide
png(p, "plot1.png"); nothing # hide

What can I do with this?