His latest movie may be called "No Strings Attached," but it seems there are quite a few hitches involved in getting director Ivan Reitman's planned "Ghostbusters" sequel off the ground.

"All of the actors but one have read [the script] and loved it," Reitman tells CNN of "Ghostbusters III." "We're waiting for one of them to read it and see where we are.”

The holdout?

“That would be the famous Bill Murray — Mr. Venkman," Reitman says of the quirky karaoke crasher/funnyman, who starred alongside Dan Aykroyd and Harold Ramis in "Ghostbusters" (1984) and "Ghostbusters II" (1989).

Reitman, 64, adds that he feels the latest installment is better than the previous two movies. "I'm really jazzed about it," he tells CNN.

And if Murray doesn't like it? “We have a very complicated deal," says Reitman. "Let's just put it that way."