check if you really have all the needed items in your bag. if you had a beer after recieving the mission but used it for another mission, it shows as if you still have it for this mission while you dont. so you need to buy another 1.
Oh My Goodness! Thank you very much. I run around the game for 3 days to figure out the issue. Now, I understand LOL :D Thanks and very beauty game bro hiiii