dbms_rls.add_policy的问题

Begin
　　Dbms_Rls.Add_Policy(Object_Schema =>'Scott'
　　,Object_Name =>'T_Policy'
　　,Policy_Name =>'T_TestPolicy'
　　,Function_Schema =>'Scott'
　　,Policy_Function =>'Fn_GetPolicy'
　　,Statement_Types =>'Select,Insert,Update,Delete'
　　,Update_Check =>'True'
　　,Enable =>'True'
　　);
End;/
第2行初雪错误：
ORA-06550:第2行，第1列
PLS-00201:必须声明标识符'DBMS_RLS'
PL/SQL:Statement ignored谢谢