Watch: Justin Timberlake, Anna Kendrick attempt, fail to light up the London Eye

During a promotion for their most recent movie, "Trolls," Anna Kendrick and Justin Timberlake visited the London Eye Friday to light up the city for the film's official launch in London.

But things didn't go according to plan.

The two stars walked a rainbow red carpet and settled on a stage where a host conducted a dramatic countdown which ended with Kendrick and Timberlake excitedly pushing a big red button.

The button was meant to turn on lights on the giant ferris wheel, and the celebrities looked up at the landmark excitedly while Timberlake's "Can't Stop the Feeling" played on loudspeakers.

But the London Eye didn't light up.

The stars stood awkwardly, looking up at the wheel. Timberlake hit the button multiple times in the hope that the lights would turn on.

They didn't.

"And all the power goes out,"  Timberlake said as Kendrick started laughing.

"Wait for it ... It's coming," the host said.

After about one minute, a team of technicians removed the podium with the button from the stage.