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"this" in this._x is not referencing wall: change "this" to wall.
kglad's right on target, as per usual :) additionally you could probably clean this up a bit by writing it a little differently. you could import the classes on the front end, and place the variables into the statement, as in below:
PS. it also looks like you've missed the last parameter needed in the Tween statement, to indicated 'frames' or 'ms' however the default value is false.
completly fixed the problem.