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x=64
y=30

r=5

g=0.1

dx=2
dy=0

floor=100

elastic=0.95 
air_res=0.999		

function _update()

 dx=dx*air_res

	dy=dy+g

	x=x+dx
	y=y+dy

 if y>(floor-r) then

 	dy=-(dy*elastic)
 	y=(floor-r)
 end

 if x<r then
 	dx=-(dx*elastic)
 	x=r
 end
 if x>(128-r) then
 	dx=-(dx*elastic)
 	x=128-r

 	--mouse check
if stat(32)==x then print("aaaaaaaaa")
 end
end

function _draw()
			cls()
	rectfill(0,floor,128,128,5)
	circfill(x,y,r,8)

		poke(0x5f2d, 1)
	spr(0,stat(32)-1,stat(33)-1)
	print(stat(34))

end

if you can please tell me how to fix this
2

Looks like a missing end after x=128-r
3

Here's a tip that I use - if you open anything (if statement, function, parentheses, etc) instantly close it. Then you can type inside it knowing that you won't forget to close it. Pico-8 has a trick for this as well: type "function my_function()" or "if bool then" or "while bool do" and then press SHIFT + ENTER. This auto-completes the statement and moves your cursor inside it so you can start typing.

If there appears an UNCLOSE error, it's usual that you forget to add an end in the if, loop or function blocks. And yeah, that's what I often meet when I try to run my demo cart.

Look at the code below and you'll figure out where you forgot an end. 

function _update()

 dx=dx*air_res

    dy=dy+g

    x=x+dx
    y=y+dy

 if y>(floor-r) then

    dy=-(dy*elastic)
    y=(floor-r)
 end

 if x<r then
    dx=-(dx*elastic)
    x=r
 end
 if x>(128-r) then
    dx=-(dx*elastic)
    x=128-r

    --mouse check
if stat(32)==x then print("aaaaaaaaa")
 end
end


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