Congratulations! You reached the maximum sprite limit!

Reduce the number of sprites in your level and the problem will dissapear. Gun barrels and crates are especially bad since each one spawns a huge load of sprites that don'to go away and quickly reaches the maximum sprite limit.

What are sprites? JJ2 events that you can see! Jazz is a sprite, ammo are sprites, power-ups are sprites, everything that dissapeared on your level are sprites.