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I have a field 'contact_outbound__c' on case object.I need a Validation rule 'If the case is createdBy 'System Admin' then only system admin can edit that field others shouldn't edit it.

We can't launch this flow because of a variable error. Send this error message to your admin. The value null is being provided for variable validationError but isn't compatible with the variable's data type (String). Check the places where you implemented the flow ‒ such as through a Lightning page or a custom button ‒ and make sure that all provided values are compatible with the variables' data types

To get rid of this I was trying to 

Click on Record Edit Page-->> From there I'm trying to give one variable to ValidationErrorMessage on flow--->> But i'm unable to find ValidationErrorMessage variable 


Need help on this