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Sejal PandeSejal Pande 

I am getting this error for a challenge on Trail head to Create a process to update child record when the parent is updated.

I am getting this error for a challenge on Trail head to Create a process to update child record when the parent is updated.    

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: TCTYWPSG
NagendraNagendra (Salesforce Developers) 
Hi Sejal,

There are few trailhead challenges where you have to use brand new developer org's to pass the challenge successfully.Please make sure you are using a brand new dev org in order to validate this challenge.

Please let us know whether you are performing the challenge in trailhead playground or developer org?

You might also get this error because your session has expired.

Please try to log out of your DE (in trailhead, not the org) and reconnect your DE to a trailhead. Then, please re-check the challenge. It should pass now.

Hope this helps.

Mark this as solved if it's resolved.

Regards,
Nagendra.
 
Sejal PandeSejal Pande
@Nagendra

I created a new DE org for the challenge and I was able to complete it.

Thanks.