Reverse engineering step prob

[ns mira]

hi there,

who can explain why i got this kind of problem? tq in advance..

error:(reverse engineering step)

Call Oracle stored procedure ANALYZE_SCHEMA for SCOTT.
CALL DBMS_UTILITY.ANALYZE_SCHEMA(?, 'ESTIMATE', 50, 0, 'FOR TABLE')
The schema could not be reverse engineered (error: 0).
ReverseEngineeringOracle.reverseEngineer :ORA-00900: invalid SQL statement

Details:
oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
oracle.jdbc.ttc7.Oall7.receive(Oall7.java:590)
oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1973)
oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1119)
oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2191)
oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:2064)
oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2989)
oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:658)
oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:736)
com.mysql.grt.modules.ReverseEngineeringOracle.reverseEngineer(ReverseEngineeringOracle.java:121)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
com.mysql.grt.Grt.callModuleFunction(Unknown Source)