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BarakBarak 

TRailHead "Using Formula Fields" gives error message 'System.DmlException: Insert failed'

Challenge not yet complete... here's what's wrong: 
There was an unexpected error in your org which is preventing this assessment check from completing: System.DmlException: Insert failed. First exception on row 0; first error: FIELD_INTEGRITY_EXCEPTION, There's a problem with this state, even though it may appear correct. Please select a state from the list of valid states.: Billing State/Province: [BillingState]