Some odd problem: GR3_ERROR_INVALUD_VALUE

[rubyFeedback]

Error is:

/root/.gem/gems/ruby-gr-0.66.0.0/lib/gr3.rb:128:in `block (2 levels) in <module:CheckError>': GR3 error /home/Temp/rbt/gr-0.66.0/lib/gr3/gr3.c 1988 GR3_ERROR_INVALID_VALUE (RuntimeError

I tried the following sample you supplied:

# frozen_string_literal: true

# RDatasets
# https://github.com/kojix2/rdatasets

require 'rdatasets'
require 'gr/plot'

passenger = RDatasets.datasets.AirPassengers
time = passenger.at(0).to_a
value = passenger.at(1).to_a

opts = { title: 'Air Passenger numbers from 1949 to 1961',
         ylabel: "Passenger numbers (1000's)",
         xlabel: 'Date' }
GR.plot(time, value, opts)
sleep 1.5
GR.step(time, value, opts)
sleep 1.5
GR.stem(time, value, opts)
sleep 1.5
GR.barplot(time, value, opts)
sleep 1.5

volcano = RDatasets.datasets.volcano.to_matrix.to_a.transpose

# Fixme
volcano = Numo::DFloat.cast(volcano)

opts = { title: "Auckland's Maunga Whau Volcano" }
GR.contour(volcano, opts)
sleep 1.5
GR.tricont(volcano, opts)
sleep 1.5
GR.contourf(volcano, opts)
sleep 1.5
GR.heatmap(volcano, opts)
sleep 1.5
GR.surface(volcano, opts)
sleep 1.5
GR.trisurf(volcano, opts)
sleep 1.5
GR.wireframe(volcano, opts)
sleep 1.5

Not sure what the error is. I installed the latest GR Linux 64 binary. gem install
for GR worked too.

Prior to the above error I get tons of this:

GKS: GKS not in proper state. GKS must be either in the state WSAC or SGOP in routine POLYLINE
GKS: GKS not in proper state. GKS must be either in the state WSAC or SGOP in routine POLYLINE
GKS: GKS not in proper state. GKS must be either in the state WSAC or SGOP in routine TEXT

I'll try some of the simpler examples next.

[kojix2]

The error is occurring at the C gr3.
Do the other samples work?