Once you press UP, the sprite disappears and the console will constantly keep throwing errors.

tween_length 0.05

========
OBJECTS

background .
darkgray

playerIdle
black white pink
.....
..2..
.111.
.111.
.0.0.

playerJumping
black white pink
.....
..2..
.111.
01110
.....

=======
LEGEND

player = playerIdle or playerJumping

p = playerIdle

SOUNDS

================
COLLISIONLAYERS

background
player, playerJumping

======
RULES

up [> player] -> [> playerJumping]

==============
WINCONDITIONS

=======
LEVELS

......
......
......
......
...p..