PLS-00201: identifier must be declared

Today I tried to compile an Invalid Object and faced the below.

Issue : 

SQL> ALTER PACKAGE OWAPUB.OWA_OPT_LOCK COMPILE BODY;

Warning: Package Body altered with compilation errors.

SQL> show error

Errors for PACKAGE BODY OWAPUB.OWA_OPT_LOCK:

LINE/COL ERROR

-------- -----------------------------------------------------------------

40/12    PL/SQL: Statement ignored

40/12    PLS-00201: identifier 'SYS.DBMS_SYS_SQL' must be declared

72/5     PL/SQL: Statement ignored

72/5     PLS-00201: identifier 'SYS.DBMS_SYS_SQL' must be declared

102/6    PL/SQL: Statement ignored

102/6    PLS-00201: identifier 'SYS.DBMS_SYS_SQL' must be declared

144/6    PL/SQL: Statement ignored

144/6    PLS-00201: identifier 'SYS.DBMS_SYS_SQL' must be declared

SQL>

Reason : In this case, the PLS-00201 error indicates that the referenced package (SYS.DBMS_SYS_SQL) does not exist, does not have execute permission or is invalid.

Solution : Grant Execute permission to the desired identifier.                                                 

SQL> grant execute on SYS.DBMS_SYS_SQL to OWAPUB;

Grant succeeded.

SQL> ALTER PACKAGE OWAPUB.OWA_OPT_LOCK COMPILE BODY;

Package body altered.

****************************நன்றி****************************