AudioProcessorGraph missing default constructor?

I’m trying to follow along with the Cascading plug-in effects tutorial and it wants to me create a default constructed AudioProcessorGraph but when I try to build I get a linker error that the default constructor is missing. I downloaded the ZIP for the tutorial and tried to build it as well to see if it worked and it too had the same linker error. Are there some Projucer settings needed to enable the AudioProcessorGraphs default constructor? I’m using JUCE v6.1.2.
Any help would be great thanks.

AudioProcessorGraph does have a default constructor, so the error is probably somewhere else in your code.

Do you know what file I would find it in? IntelliSense is telling me it can’t find it too.