You should make sure that you created the package in the right place.
try running this and posting the results.

Code:
set linesize 90
column owner       format a20
column object_name format a30
column object_type format a20

show user

select owner, object_name, object_type 
  from dba_objects 
 where object_name='SAMIR_TEST' 
 order by 1,2,3;