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Giovanni DelNeroGiovanni DelNero 

Trailhead Developer Intermediate Custom Metadata Types: Creating and Managing Custom Metadata Types


when checking the challenge related to the trailhead in the subject I get the following error:

There was an unhandled exception. Please reference ID: SLSTSMQD. Error: Faraday::ClientError. Message: INVALID_TYPE: VAT_Rate__c, MasterLabel from VAT_Data__mdt ^ ERROR at Row:1:Column:43 sObject type 'VAT_Data__mdt' is not supported. If you are attempting to use a custom object, be sure to append the '__c' after the entity name. Please reference your WSDL or the describe call for the appropriate names.

Might it be related to the fact that in my Dev Org it is enabled the namespace prefix?

Thanks and Kind Regards,
Best Answer chosen by Giovanni DelNero
JyothsnaJyothsna (Salesforce Developers) 

It is due to namespace issue. Trailhead does not support namespaced DE Orgs. Due to the namespace, the API names will be differently appended with namespace and hence it is not verifying your results.Try in other dev org.To login into trail head you can use your old org but for activity(code and config) related changes you can use new org. In such a way all point will add in your old profile only.
For reference, please check the below link:


Best Regards,