We can't find the '{name}' attribute in the selector.html file.
According to this video,
I should put the code "{name}" in between
andThen it worked.
I will keep my post for those who have the same problem in the future.
you can solve this error by following steps first go to manage playground delete all the playground expect the one one you are using for this challenge in your case its (MY TRAILHEAD PLAYGROUND 1) then go to vs code then again author org then deploy in default org then come back to challenge page, click on 3 dots present side of the playground you will see the another playground expect the one your using select that and connect the org then verify the challenge .