What is wrong here : In Debug Your Code Unit Trailhead?

Error : Step not yet complete in My Trailhead Playground 1

We did not find any checkpoints for 'AccountService'. Make sure to select a line number in the Apex class and run the commands 'SFDX: Toggle Checkpoint' then 'SFDX: Update Checkpoints in Org' in Visual Studio Code.

I have checked through dev console also the class has a checkpoint there.