The Type of the role player provided in the DomainRoleAttribute for DomainRole '{0}' on DomainRelationship '{1}' is not a ...

The Type of the role player provided in the DomainRoleAttribute for DomainRole '{0}' on DomainRelationship '{1}' is not a valid DomainClass. The Type provided is '{2}'. If this DomainClass is defined in another DomainModel, make sure that DomainModel is loaded first.