bullet turned invisble

I am following the Ghost Tutorial, and suddenly my bullet is invisble when previewing/debugging the project.

When I place the bullet on the layout, I see it flying away once (in preview mode), but it doesn't spawn out of the Player Object, while clicking the mouse button. Before it did.

When aiming and shooting at the green tutorial monsters, they do get hit though, I just don't see the bullets flying.

Do you have any suggestion what I configured wrongly?

Are you creating/spawning the bullets on the correct layer?

did you add a image point in image editor to where you want your player to fire out.

Are you creating/spawning the bullets on the correct layer?

Beginner's mistake

After adding layers, the numbering of layers changes. Thanks.

So in future I should, after adding a layer, check all objects that depend on layer-visibility?

Is it of any use to add a number and name to a layer?

So that, in event sheet, you think: I want the bullet always visible on the "ground layout", number x (no matter what it will be in future).

Just use the layer name. In quotes.

Just use the layer name. In quotes.

Thanks