Rooftops Campaign is a fan-made singleplayer campaign mod for Call of Duty 4. It includes a brand new storyline, cool new innovative scripted sequences, intense gunfights, and fun mission concepts.
A small patch that fixes that unreasonable mission failed function when you throw the rock where you were supposed to throw it.
Had that happen to me too. I thought i threw it wrong hence why i did't report this bug
good patch