无法调用内置过程

Question

我试图用这个命令调用oracle中的内置过程：

CALL ttOptEstimateStats( 'orders_100_opt', 1, '10 PERCENT' );

我收到此错误：

CALL ttOptEstimateStats( 'orders_100_opt', 1, '10 PERCENT' )
Error report -
SQL Error: ORA-06576: not a valid function or procedure name
06576. 00000 -  "not a valid function or procedure name"
*Cause:    Could not find a function (if an INTO clause was present) or
           a procedure (if the statement did not have an INTO clause) to
           call.
*Action:   Change the statement to invoke a function or procedure

我的代码应该更改什么？我怎么解决这个问题？