Unable to catch the error pls help

Question

Hi all am trying from last two hours but strangely unable to catch the error inthe below procedure..
Ignore what the functionality is but look at these steps in the procedure ;Look at these two steps below in the procedure....
It goes wrong at this point......
v_acct_nb := in_acct_gp_array(i).gp_dtl_array(j).account_id;
SELECT DISTINCT account_id INTO v_acct_dim_nb FROM ats_ACCOUNT WHERE account_id = v_acct_nb ; ----> this throws exception that no rows found
I can see that values are passed into v_acct_nb variable.... but the second statements returns exception saying no data found .
But
when i hard code the value returned in the variable in the second statement like below it works ....
v_acct_nb := in_acct_gp_array(i).gp_dtl_array(j).account_id; /* say i received the value v_acct_nb =20 */
SELECT DISTINCT account_id INTO v_acct_dim_nb FROM ats_ACCOUNT WHERE account_id = '20'; -----> this works
whats the issue here ?
CREATE OR REPLACE PROCEDURE add_appl_dummy2( in_usr_id VARCHAR2,in_acct_gp_array appl_acct_gp_array,v_status_message OUT VARCHAR2)
IS
v_usr_dim_nb INTEGER;
v_acct_dim_nb  VARCHAR2(35);
v_user_exception     EXCEPTION;
v_account_exception     EXCEPTION;
v_acct_in_othr_group_exception  EXCEPTION;
v_grp_already_exist_exception  EXCEPTION;
v_acct_nb  VARCHAR2(35);
v_error_code         VARCHAR2(50);
v_error_msg          VARCHAR2(50);
v_dflt_appl_acct_gp_nm VARCHAR2(50);
v_dflt_appl_acct_gp_id INTEGER;
v_count NUMBER;
BEGIN
        /* verify if the user is valid */
        BEGIN
            SELECT usr_id INTO v_usr_dim_nb FROM TSS_USR WHERE access_id =in_usr_id ;
            EXCEPTION WHEN NO_DATA_FOUND THEN
              v_error_code := SQLCODE;
              v_error_msg  := SQLERRM;
            RAISE v_user_exception; 
        END;
DBMS_OUTPUT.PUT_LINE('1');
        FOR i IN in_acct_gp_array.FIRST.. in_acct_gp_array.LAST
        LOOP
            /* Verify if the user has already created an account group with the same name */
            BEGIN
              SELECT COUNT(1) INTO v_count FROM RPT_ACCT_GP WHERE usr_id=v_usr_dim_nb AND appl_acct_gp_nm=in_acct_gp_array(i).appl_acct_gp_nm;
              IF v_count >0 THEN
DBMS_OUTPUT.PUT_LINE('2');
                  RAISE v_grp_already_exist_exception;
              ELSE
DBMS_OUTPUT.PUT_LINE('3');
                  NULL;
              END IF;
            END;
DBMS_OUTPUT.PUT_LINE('4');
            FOR j IN in_acct_gp_array(i).gp_dtl_array.FIRST..in_acct_gp_array(i).gp_dtl_array.LAST
            LOOP
                  *v_acct_nb := in_acct_gp_array(i).gp_dtl_array(j).account_id;*    
   *SELECT DISTINCT account_id INTO v_acct_dim_nb FROM ats_ACCOUNT WHERE account_id = v_acct_nb ;*
   IF v_acct_dim_nb IS NULL THEN
    DBMS_OUTPUT.PUT_LINE('is null');
   ELSE
                 DBMS_OUTPUT.PUT_LINE(v_acct_dim_nb); /* verify if the account number is valid */
                     DBMS_OUTPUT.PUT_LINE(v_acct_nb);
                     END IF;
         END LOOP;
    END LOOP;
COMMIT;
DBMS_OUTPUT.PUT_LINE('9');
v_status_message:='SUCCESS';
EXCEPTION
    WHEN v_user_exception THEN
         v_status_message:= 'Invalid user id :'||in_usr_id ||' '||v_error_code||' '||v_error_msg;
    WHEN v_grp_already_exist_exception THEN
         v_status_message:= 'Group with the same name already exists ';
    WHEN OTHERS THEN
         v_status_message:= SQLCODE||' '||SQLERRM;
END;
SELECT DISTINCT account_id  FROM ats_ACCOUNT WHERE account_id='000000400127032'

Answer 1

Please remove this bug anyway:
    WHEN OTHERS THEN
         v_status_message:= SQLCODE||' '||SQLERRM;