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Nitish BajajNitish Bajaj 

reference error id: IFRINKLL

Same Error in  Admin beginner -> Lightning Experience Customization -> Create Custom Links and Buttons

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: IFRINKLL
SwethaSwetha (Salesforce Developers) 
HI Nitish,

We have separate Trailhead team who can help you with these issues. So,can you please use the below link to reach out to them so that one of the Engineers will get in touch with you.
Support:https://trailhead.salesforce.com/help

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. 

Thanks
Nitish BajajNitish Bajaj
Thanks, Swetha. Surprisingly this morning anyways the whole error got cleaned up and I was able to get to the next stage. And also thanks for guiding me to trailhead help. Hence this is solved and we can close this thread.