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Jhon Cortes GasparJhon Cortes Gaspar 

If you're using a new DE and seeing this error, please post to the developer forums and reference error id: WQGSKVRQ

Narender Singh(Nads)Narender Singh(Nads)
Hi Jhon,
Try creating a new trailhead playground and re-do the challenge.

Regards,
Narender