net.sourceforge.plantuml.svek.EmptySvgException
The exception is caused by an incomplete installation of GraphViz, in particular the 'dot' component.
To resolve this, open the Terminal app and on the command line, type:
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sudo dot -c
You can test the installation of GraphViz, using the following command in Terminal:
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java -jar <YOUR TOMCAT FOLDER>/webapps/essential_viewer/WEB-INF/lib/plantuml.jar -testdot