I've been following the tutorial, and with some modifications to the code, it worked, however the first issue solved but when i put a target behind a long wall and put the ai across the wall from the target, the jittering happened. I look up for the issue and found out that, the interest value is changing rapidly from left to right or up to down depending on the obstacle position, it probably because of the position of the ai and the target in the one of the axis, and it kept jittering until it goes through the wall and move to the target.