LÖVE

function Player:keyPressed(key)

if key == "space" then
--to test\/
print("player.x, player.y", self.x, self.y)
--to test/\
table.insert(listOfBullets, Bullet(self.x, self.y))
--also to test \/
for i,v in ipairs(listOfBullets) do
--v:update(dt)
print (i,v.x, v.y)
end
end
end

and if this helps:

function love.update(dt)
player:update(dt)
enemy:update(dt)

for i,v in ipairs(listOfBullets) do
--the thing causing the error
--\/
--v:update(dt)
end
end

player.x, player.y nil nil
1 nil nil
when i press space/\

Is this all of the code? If not then you need to provide everything you’ve written. Right now I don’t see self.x and self.y being set anywhere.

Also, for context, what, if any, programming background do you have?