SQL & PL/SQL

Hi,

I am finding the below given error while re-compiling a procedure.
Anybody can help me... Thanks in advance

SQL> ALTER PROCEDURE INVOICETAXSCHEDULE compile;

Warning: Procedure altered with compilation errors.

SQL> sho err
Errors for PROCEDURE INVOICETAXSCHEDULE:

LINE/COL ERROR
-------- -----------------------------------------------------------------
0/0 PLS-00904: insufficient privilege to access object SYS.PLITBLM
0/0 PLS-00904: insufficient privilege to access object SYS.PLITBLM
0/0 PLS-00904: insufficient privilege to access object SYS.PLITBLM
0/0 PLS-00904: insufficient privilege to access object SYS.PLITBLM
0/0 PLS-00904: insufficient privilege to access object SYS.PLITBLM
0/0 PLS-00904: insufficient privilege to access object SYS.PLITBLM
242/6 PL/SQL: Statement ignored
242/22 PLS-00302: component 'EXISTS' must be declared
414/9 PL/SQL: Statement ignored
414/25 PLS-00302: component 'EXISTS' must be declared
600/6 PL/SQL: Statement ignored

LINE/COL ERROR
-------- -----------------------------------------------------------------
600/22 PLS-00302: component 'EXISTS' must be declared
756/7 PL/SQL: Statement ignored
756/23 PLS-00302: component 'EXISTS' must be declared
890/6 PL/SQL: Statement ignored
890/22 PLS-00302: component 'EXISTS' must be declared
966/2 PL/SQL: Statement ignored
966/18 PLS-00302: component 'FIRST' must be declared

Regards,
Sk