Filmmaker Frank Darabont has hit out at movie mogul George Lucas for preventing Steven Spielberg from shooting his script for the upcoming Indiana Jones sequel, claiming his efforts were "a waste of a year". Darabont wrote a screenplay for the highly-anticipated movie, which is still known by its working title of Indiana Jones 4, and insists director Spielberg was happy with it. However, producer Lucas didn't think it was good enough. Darabont tells MTV.com, "It showed me how badly things can go. "I spent a year of very determined effort on something I was very excited about, working very closely with Steven Spielberg and coming up with a result that I and he felt was terrific. "He wanted to direct it as his next movie, and then suddenly the whole thing goes down in flames because George Lucas doesn't like the script. "I told him (Lucas) he was crazy. I said, 'You have a fantastic script. I think you're insane, George.' You can say things like that to George, and he doesn't even blink. He's one of the most stubborn men I know. He adds, "I have no idea if there's a shred of (my script) left. It was a tremendous disappointment and a waste of a year." And Darabont has no plans to reveal what his Indiana Jones script contains: "At this point, I don't give much of a damn what George thinks, but I wouldn't want to harm my friendship with Steven."