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Uncaught exception when following tutorial

I've been trying to follow the tutorial: https://protegewiki.stanford.edu/wiki/Protege4Pizzas10Minutes At the step "Go the Property Matrix tab", https://protegewiki ...
GitHub

Uncaught exception happened in wrapper. Told me to do this.

at com.probejs.docs.DocCompiler.lambda$compile$12(DocCompiler.java:351) ~[probejs-6.0.0-forge.jar%23683!/:?] at java.util.stream.ReferencePipeline$3$1.accept(Unknown ...