Hello All, 

I have a question. I am attempting to do the Build an Instant Notification App project.
I've done all steps provided from the Trailhead but when I try to test,
I'm getting the following error at the Homepage of the Trailhead Playground:



Possible to let me know how to fix this error ?
Appreciate your great help and thanks in advance.

Hello All, 

I have a question. I am attempting to do the Build an Instant Notification App project.
I've done all steps provided from the Trailhead but when I try to test,
I'm getting the following error at the Homepage of the Trailhead Playground:



Possible to let me know how to fix this error ?
Appreciate your great help and thanks in advance.