R-Pattz Motivated By Chance Of 'Devastating Failure'
The actor has also slammed the media in wake of K-Stew's cheating...
During an interview with Cosmopolisstar revealed: "I think as soon as you feel validated, you're a bad actor.
"You have to constantly feel that there's a 99 percent chance of failure. Total failure. Devastating failure. You should feel like every single job is the potential where you're never going to get another job again."
He added: "Not in a bad way — you should feel good about it, because then you're in it. It's all about living in the present."
Their co-star Taylor Lautner has also cancelled his appearance at the event, with Creation Entertainment telling Zap2it: "The passion and dedication of Twilight fandom has been amazing and we're out to throw one last giant convention, a final gathering to see old friends that have made up the Twilight family.
"Although Rob, Kristen and Taylor will not be with us this time out we will have a super lineup of other Twilight stars and the weekend will be filled with special events, movie prop and costume displays, contests, panels, auctions, parties, exclusive merchandise, music and much more, including some surprises!"
Kristen's first public appearance since she admitted to being unfaithful to Rob is thought to be at the Toronto Film Festival next month, where she will be on hand to promote new flick On The Road.