Creating a Project using Pa_project_PUB.create_project error

 Hi all,                  I am trying to create a project(intially) as part of a Project conversion.i am getting all kind of weared errors.could anybody help me on this one.I am attaching the code below .The API doesn't return any error message. help would be highly appreciated.

set serveroutput on size 20000

-- Uses the cost plus template.

DECLARE
  -- Variables needed to create task hierachy
  level1      NUMBER;
  level2      NUMBER;
  level3      NUMBER;
  a       NUMBER;
  m       NUMBER;
  --l_user_id NUMBER;
  l_responsibility_id NUMBER;
  parent_level1     VARCHAR2(30);
  parent_level2     VARCHAR2(30);
  parent_level3     VARCHAR2(30);
  number_of_tasks1    NUMBER;   -- number of tasks/levels