Generating Callgraph with XHGUI

I had a frustrating bug the other day with a new XHGUI install, I am working on creating a VM for my new PHP tools course I am teaching in March and I wanted to pre-install and part-install a bunch of things so that I can show some great tools in a limited amount of time. My XHGUI wasn't quite right though; it couldn't generate the callgraph for me. Instead, it said:

failed to shell execute cmd=" "" -Tpng"

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