In the Report & Dashboard superbadge in challenge number 3, I am getting the below error. Any help will be great!!!

Hey Friends,

I am stuck at challenge 1 of Lightning Experience Rollout Specialist .It has been 24 hrs and optimizer is still running and showing as below screen.

when trying to check challenge,I am getting error as 
"Challenge Not yet complete... here's what's wrong: 
You need to run Salesforce Optimizer for your org."
Anyone of you encountered this .Any clues? 

Hi,
I am not able to run optimizer in my org, can anyone please help me