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First of all, this isn't really a SQL Developer question. You should ask questions like this in either the PL/SQL and SQL or General Database Discussions forums.
Having said that, it is just a matter of verifying the existence, validity, permissions and synonyms for the DBMS_CRYPTO package.
I'm surprised this sort of thing isn't covered in the OCP certification.
I'm sorry but I don't know where this identifier DBMS_CRYPTO is...(to which package does it belong??')....anyway ok thank for the suggestion I'll post this question on another forum...