error with jpa - " is not a known entity type"

[ics]

hi, iven trying to use jpa, but when i try to persists , im getting the error "xx is not a known entity type", its like the class im using its not in the persistence.xml file, but if i look there the checkbox named "include all classess in ...." its checked,

another anoying thing its that if i try to use hibertnate instead toplink , the error its the same and it says that the provider its toplink...