Getting this error gnuplot.rb:219:in `instance_of?': class or module required (TypeError) when running examples.

[DouglasAllen]

I have Gnuplot installed on Windows 10 and is on the [path settings].
The gem version is 2.6.2 from a 'gem install gnuplot'

[Running] ruby "c:\Ruby23-x64\lib\ruby\gems\2.3.0\gems\gnuplot-2.6.2\examples\sin_wave.rb"
c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:219:in instance_of?': class or module required (TypeError) from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:219:in plot_args'
from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:160:in block in store_datasets' from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:160:in collect'
from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:160:in store_datasets' from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:102:in initialize'
from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/examples/sin_wave.rb:4:in new' from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/examples/sin_wave.rb:4:in block in

'
from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:74:in block in open' from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:73:in popen'
from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:73:in open' from c:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/examples/sin_wave.rb:3:in '

[Done] exited with code=1 in 0.708 seconds

That was in VS Code editor.
The command line would be similar but I'll give it to ya.
C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:219:in instance_of?': class or module required (TypeError) from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:219:in plot_args'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:160:in block in store_datasets' from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:160:in collect'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:160:in store_datasets' from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:102:in initialize'
from sin_wave.rb:4:in new' from sin_wave.rb:4:in block in

'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:74:in block in open' from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:73:in popen'
from C:/Ruby23-x64/lib/ruby/gems/2.3.0/gems/gnuplot-2.6.2/lib/gnuplot.rb:73:in open' from sin_wave.rb:3:in '

[DouglasAllen]

Since I see that this version is different I went ahead and installed 2.6.1 this one and tests, and some examples work just fine. But I am now getting an error with the Rake task to install and s few others.
One is with the generated gemspec.
rake aborted!
ArgumentError: $SAFE=2 to 4 are obsolete
gnuplot.gemspec:1:in `block in parse'
Tasks: TOP => install => build
But again the gem at rubygems will suffice for me even though I learned a thing or two with this master.

[rdp]

2.6.2 failed but 2.6.1 passed?

On Sat, Nov 12, 2016 at 11:20 PM, Douglas G. Allen <notifications@github.com

wrote:

Since I see that this version is different I went ahead and installed
2.6.1 this one and tests, and some examples work just fine. But I am now
getting an error with the Rake task to install and s few others.
One is with the generated gemspec.
rake aborted!
ArgumentError: $SAFE=2 to 4 are obsolete
gnuplot.gemspec:1:in `block in parse'
Tasks: TOP => install => build
But again the gem at rubygems will suffice for me even though I learned a
thing or two with this master.

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