Salesforce Trailhead challenge error BTSTRGLJ

Hi All,

Was doing trailhead after a long time to increase the points but encountered with a strange error.

The topic which I was doing was "Navigating and Personalizing Salesforce" on trailhead. After performing the task when I checked the challenge it threw the below error:-

"Challenge Not yet complete... here's what's wrong:
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: BTSTRGLJ".

Has anyone any idea regarding this?

Thanks in advance.