I was looking at a copy of someone’s activity:
Slide 5 I was trying to access a number from the graph, but it thinks it’s a table:
There is a table in the activity also named “this” You can see that there are two aliases for “this” 
The table is on screen 9. Renaming it fixes the suggestion:
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Thanks. I noticed the two “this” and didn’t think to check component names.