Hello there!
Your syntax seems to be correct, are you sure you get your names correct?For example, if you renamed your tracker node “image_track” or something, of course you should use this name in the expression.
Thus, “=image_track.tracker1.x”; but I guess you figured that out….
Strange you have an error message; if in any way the expression syntax is not right, Nuke should’t give any errors, the expression just would not work and return no values. Do you have this problem with just the Bezier node or do all of your expressions not work? Try linking two Transform nodes, for example. If you still get errors, I think it’s time to contact D2.
Good luck! ❗