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Ketul shah 7Ketul shah 7 

Add a custom button to a contact: error :RDYRVZTN

Benn getting this error :
If you're using a new DE and seeing this error, please post to the developer forums and reference error id: RDYRVZTN
NagendraNagendra (Salesforce Developers) 
Hi Ketul,

Sorry for this issue you are encountering.

May I request you please confirm if you are using a brand new developer org for validating the challenge?

If you are using a brand new developer org then please double check that your org doesn't have a namespace enabled.If that doesn't help please give a try by restarting the batch

Still, if the problem persists log out of all accounts and log in once again in a different browser by clearing the cache and cookies which should probably do the trick.

Please let us know if this helps.

Mark this as solved if my reply was helpful.

Thanks,
Nagendra