Hi,

I have followed several different solutions to this step, but still, I am recieving this error: 

"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_CUSTOM_VALIDATION_EXCEPTION, error: [Name]"

Has anyone got any ideas on how to solve this? 

Please let me know what you need of information from this. I have the following validation rules on opportunity object :
"Approved field validation": 
AND( 
ISCHANGED(Approved__c), 
OR( 
$Profile.Name <> 'System Administrator', 
$Profile.Name <> 'Custom: Sales Profile' 
) 
)

High Value Opportunity Validation:

AND( 
IsClosed = TRUE, 
Amount > 100000, 
Approved__c <> TRUE 
)