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stack frame and undefined error

M

matethatsfine

Guest
i have created a timeline that makes a fireball move forward, but it says it is undefined and i have a "stack frame" my code is "obj_fireball.phy_position_y -= 3"
i haven't used this website before, so sorry if this is posted in the wrong place or not worded well.
if anyone has any idea , please can you help.
this is the full error:

___________________________________________
############################################################################################
FATAL ERROR in
action number 1
at time step0
of time line tml_fireball:
DoSub :2: undefined value
at gml_Timeline_tml_fireball_0_1 (line 1) - obj_fireball.phy_position_y -= 3
############################################################################################
--------------------------------------------------------------------------------------------
stack frame is
gml_Timeline_tml_fireball_0_1 (line 1)
 
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