SQL0035N The file "P5353255.msg" cannot be opened

Hi,
I'm trying to create a SQL stored procedure, but after I ran
db2 -td@ -vf getAllChanges.db2
I got the following error:
--------------------
DB21034E  The command was processed as an SQL statement because it was not a
valid Command Line Processor command.  During SQL processing it returned:
SQL0035N  The file "P5353255.msg" cannot be opened.
--------------------
There is a file called P5353255.sqc being created in /home/db2inst1/sqllib/function/routine/sqlproc/SOMEDB/DB2INST1/tmp directory, and the group id and user name are correct, I wonder why it cannot open the file P5353255.msg. Obviously it could created the file in the first place. My SQL stored procedure is as follows:

CREATE PROCEDURE get_all_changes ( IN p_group_name VARCHAR(15),
                                   IN p_inst_name VARCHAR(15),
                                   IN p_num_of_days INT)
    SPECIFIC get_all_changes
    DYNAMIC RESULT SETS 1
    LANGUAGE SQL
gac: BEGIN

    DECLARE v_dynSQL VARCHAR(200);
    DECLARE v_inst_num SMALLINT DEFAULT 1;
    DECLARE v_no_data SMALLINT DEFAULT 0;
    DECLARE v_hist_table VARCHAR(30);
    DECLARE v_stmt STATEMENT;
    DECLARE c_hist CURSOR WITH RETURN TO CALLER FOR v_stmt;
    DECLARE CONTINUE HANDLER FOR NOT FOUND
        SET v_no_data=1;

    SET v_hist_table = p_group_name||'_HIST';

    SELECT inst_num INTO v_inst_num FROM inst_lookup WHERE group_name=p_group_name AND inst_name=p_inst_name FETCH FIRST 1 ROW ONLY;

    IF (v_no_data=0) THEN
        SET v_dynSQL = 'SELECT param_name, from_value, to_value, date_modified FROM ' ||
                        v_hist_table || ' WHERE inst_num=v_inst_num AND modified_date>=current timestamp -      p_num_of_days days ORDER BY param_name';
        PREPARE v_stmt FROM v_dynSQL;
        OPEN c_hist;
    END IF;
END gac@

Any help will be appreciated.