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Ashok Kumar 454Ashok Kumar 454 

In the validation rule named 'Revenue_Validation', we can’t find a reference to '$CustomMetadata.Support_Tier__mdt.Gold.Minimum_Spending__c'.

I have been trying to complete this trail
Use Custom Metadata Types in Formulas, Default Values, and Validation (
 but can't be able to solve it
My Validation rule is 
IF(( ISPICKVAL( Support_Tier__c , "Gold") && ( AnnualRevenue < $CustomMetadata.Support_Tier__mdt.Gold.Minimum_Spending__c * 20)), TRUE, FALSE)

but I'm Receiving a weird error called
"Challenge not yet complete in Creative Hawk Playground
In the validation rule named 'Revenue_Validation', we can’t find a reference to '$CustomMetadata.Support_Tier__mdt.Gold.Minimum_Spending__c'."

even though it was there in the Validation rule
PriyaPriya (Salesforce Developers) 
Hey Ashok,

I have seen that many users has faced the same issue. And they were able to solve by creating that module  again from the scracth. for e.g refer this :-

If it still not solved, Kindly reach out to 
Trailhead Help ( they can provide the better assistance on this.

If you like the informaiton, kindky mark it as the best answer.

Thanks & Regards,
Priya Ranjan
Manohar shekhawat 4Manohar shekhawat 4
Following formula working for me:
IF( ISPICKVAL( Support_Tier__c , "Gold" ) && AnnualRevenue < 20*$CustomMetadata.Support_Tier__mdt.Gold.Minimum_Spending__c , true, false)
Manibalan SampathkumarManibalan Sampathkumar
Thanks @Manohar shekhawat 4, it works for me too!!