possible reason:
 
connect scott/tiger

create or replace procedure proc
as
   <b>emp</b>  varchar2(3);
begin
   insert into <b>emp</b> values ( 3 );
end;
/
show errors
 
Warning: Procedure created with compilation errors.
 
SQL> show errors
Errors for PROCEDURE PROC:
 
LINE/COL ERROR
-------- -----------------------------------------------------------------
5/2      PL/SQL: SQL Statement ignored
5/14     PLS-00356: 'EMP' must name a table to which the user has access

connect test/test
 
drop table log;
create table log (
   id number(3)
   );
   
create or replace procedure proc
is
begin
   insert into log values ( 1 );
end;
/
show errors
 
Warning: Procedure created with compilation errors.
 
SQL> show errors
Errors for PROCEDURE PROC:
 
LINE/COL ERROR
-------- -----------------------------------------------------------------
4/2      PL/SQL: SQL Statement ignored
4/14     PLS-00356: 'LOG' must name a table to which the user has access
 
 
 
drop table sin;
create table sin (
   id number(3)
);
 
create or replace procedure proc
is
begin
   insert into sin values ( 1 );
end;
/
show errors
 
Warning: Procedure created with compilation errors.
 
SQL> show errors
Errors for PROCEDURE PROC:
 
LINE/COL ERROR
-------- -----------------------------------------------------------------
4/2      PL/SQL: SQL Statement ignored
4/14     PLS-00356: 'SIN' must name a table to which the user has access