There was a random curse on the Crystal Empire, there were no ponies in the empire..... Until Twilight checked inside.... But then it disappeared... The others are talking

Pinkie Pie: "Where's Twilight...?" Rarity: "Yes, I even checked the inside of Crystal Empire! But something happened to me..." Rainbow Dash: ignoring Applejack: 'I'm worried...' Fluttershy doesn't say anything