Scott apologized on Twitter to all the ragers planning on attending, saying he's unable to "pull up" but promises to be back soon.
Trav was set to take the main stage on Saturday, but now that honor goes to Future x Metro Boomin. J Cole's headlining Friday and Kendrick Lamar on Sunday.
We broke the story ... Travis suffered a dislocated knee while performing earlier this month at NYC's Rolling Loud Fest. He landed on his leg awkwardly as he was jumping up and down during a song, but popped up and finished the show nonetheless.
All signs pointed to him having surgery to fix the injury, but it's unclear if he ever did or just needs more time to recoup naturally.