You need to use the & sign instead of the @ sign. Also, the background you’re using is a looping one which means the background will move on its own, so you don’t need to make him actually walk to a spot, you can just place him at the spot and make him do a running animation which will make it look like he is running.
EXT. MOUNTAIN ROAD LOOP - DAY
NARRATOR
Jason’s POV
&LITTLE JASON is run_jog
NARRTOR (JASON)
Dialogue.
This thread is for script errors only. If you have any other questions or problems that don’t have to do with script errors, please reply on my help thread: Dara’s Official Help Thread. Thanks!