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Sourav Ghosh 21Sourav Ghosh 21 

There was an unhandled exception. Please reference ID: RVLHBBOZ. Error: Faraday::Error::ResourceNotFound. Message: NOT_FOUND: The requested resource does not exist Note: you may run into errors if you've skipped previous steps

How to resolve this error at Creating a Visualforce Page in Conference Management App? 
I have followed all the steps the said. But still I am getting this error - "There was an unhandled exception. Please reference ID: RVLHBBOZ. Error: Faraday::Error::ResourceNotFound. Message: NOT_FOUND: The requested resource does not exist  Note: you may run into errors if you've skipped previous steps."

Please Help!
Bruce StewartBruce Stewart
I had a similar error working in a Dev org where there was a Namespace present.
For Trailhead, the 1 or 2 issues that caused me, I had to perform those tasks in a separate dev org.

Do you have a namespace present?
SAHG-SFDCSAHG-SFDC
I have the same issue as well I have not skipped any steps, How do we resolve?
SAHG-SFDCSAHG-SFDC
I noticed that the reference ID keeps changing every time I refresh, Do I have to incoporate that ID some where?