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Sumeet_ForceSumeet_Force 

TDRLLFFO Trailhead Error during Contact Button Link Challenge

I got this error while performing this challenge:

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: TDRLLFFO

The challenge looks simple and I dont see any mistakes from my end. There was custom configured pre-existing link which I deleted to avoid any conflicts. However still the error exists.

Switching to a new DE will not carry my other trailhead points over and hence looking for assisting in this Dev Org itself.
Best Answer chosen by Sumeet_Force
Sumeet_ForceSumeet_Force
Hi Pratik..
I was able to solve it in another org...seems that was a namespace issue with my other org...
Done with all trailhead modules & acquired all badges !!

All Answers

Sumeet_ForceSumeet_Force
Another similar error on contact layout exercise : GLRJWQAE
PratikPratik (Salesforce Developers) 
Hi Summet,

Thanks for the information. Team will get back to you.

Thanks,
Pratik
Sumeet_ForceSumeet_Force
Hi Pratik..
I was able to solve it in another org...seems that was a namespace issue with my other org...
Done with all trailhead modules & acquired all badges !!
This was selected as the best answer