U2 frontman Bono has blamed the soaring €45m costs of his 'Spider-Man' production on the numerous delays in bringing it to the Broadway stage.
And the U2 singer has admitted having major doubts over whether the show would ultimately be considered a success, given the huge amount of money that has been spent.
The mega-musical, with a score written by Bono and bandmate The Edge, will finally preview on Broadway in New York this weekend -- more than nine years after they first started work on it.
The production had been "easier than we could ever have imagined. Harder than we ever thought", Bono told entertainment magazine 'Billboard' yesterday.
"I mean, easier in the sense that the music came to us effortlessly. Dreaming up the show, the scale of it, the flying sequence, the pop-art opera that it is -- that was all pure joy.
"What we didn't realise was how difficult it is to stage this stuff, both technically and financially."
'Spider-Man: Turn Off The Dark' will feature a 41-member cast, 18 orchestra members and aerial stunts designed by a Cirque du Soleil star that will shoot actors through the air and over the audience at 60kmh.
However, the production has been dogged by delays, and has received major adverse publicity for the huge costs incurred and the number of producers and stars -- including Evan Rachel Wood and Alan Cumming -- who signed up and then left.
Bono admitted there was a level of trepidation ahead of its opening, which was scheduled for earlier this month and earlier this year before the latest delays. If technical difficulties persist, he is concerned the audience will stay away.
"Is there jeopardy?" Bono asked. "Yes. Because it's technically very difficult. It has never been achieved before -- the kind of scale of what we're looking for. There may be very good reasons. We're going to find out. The expense of it? A lot of it was the delays."
The Edge said: "As much as we've used our experiences with U2 to inform the way that we approach writing for this, we think that the opposite will happen, and when we come back to U2 Land, it'll be with a certain knowledge and sense of new thoughts and new ideas."
The show will preview this Sunday at Foxwoods Theatre on 42nd Street, before the official premiere on January 11.
"I think even though it looks like there's a lot of ill will against us, I think it'll turn around," Bono said.
"If it's just spectacle, we will have failed. But if you can be moved, and if you believe these characters, and. . . you really buy into the myth, it's a great American story."