All Oracle Error CodesOracle DBA Forum

O2F-00337:

Schema not found, or no types found in schema
Cause: A request was made to generate declarations for all the types in a database schema. Either the schema was not found, no user-declared types were found in the schema, or unable to connect to Oracle.
Action: Ensure that a login/password string was specified for OTT and that the Oracle database can be accessed with it. Ensure that the USER_TYPES table contains at least one row.