This page indicates how to troubleshoot.
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Issues when using the plugins

‘Graphwalker’ references non existing library

Problem : You get the following message in the problem view
The container ‘Graphwalker’ references non existing library ‘/Users/…/.m2/repository/org/graphwalker/graphwalker-cli/4.0.0-SNAPSHOT/graphwalker-cli-4.0.0-SNAPSHOT.jar’
Solution: Make sure you followed the prerequisites installation

Can’t find the palette to add vertex or edge

You need to open the palette first and the you will be able to do so. It can be open when clicking on the triangle in the upper right corner of the editor.

Palette button