IG.GL error between igeo and processing 2.1

I receive this error while working with the iGeo.

java.lang.NullPointerException at processing.mode.java.runner.Runner.findException(Runner.java:926) at processing.mode.java.runner.Runner.reportException(Runner.java:871) at processing.mode.java.runner.Runner.exceptionEvent(Runner.java:797) at processing.mode.java.runner.Runner$2.run(Runner.java:686)

The error occurs in the following code.

import processing.opengl.*;

import igeo.*;

size( 480, 360, IG.GL );

new IPoint(0,0,0); new IPoint(20,0,0); new IPoint(20,20,0); new IPoint(0,20,0);

What might be the issue with IG.GL? And to be honest I am not sure what this error means.

Answers

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