I'm getting an error message like this: "The following error occurred: tickets.person cannot be referenced directly. Please reference a specific column." What does this mean?
This happens when your query is referring to a table, instead of a particular column of values within that table.
In this case, you are doing a "FROM tickets" query. You can see in the tickets table that you can reference tickets.person; this is not a reference to a column in the tickets table (like, say, tickets.id), but a cross-reference to a table that stores columns of data about people. This is indicated because Person is in italics.