Getting ORA-01001: invalid cursor when I try to parse my SQL statement with DBMS_SQL

Question

-- To modify this template, edit file PROC.TXT in TEMPLATE
-- directory of SQL Navigator
-- Purpose: Briefly explain the functionality of the procedure
-- MODIFICATION HISTORY
-- Person Date Comments
TYPE column_find IS VARRAY(999) of VARCHAR2(4);
v_client_column varchar2(4);
v_errorcode NUMBER;
v_errortext VARCHAR2(200);
i number :=0;
V_COLUMN_NAME varchar2(20);
V_COLUMN_NAME2 varchar2(20);
v_SQL_STMT varchar2(2000);
v_c_hndl integer;
v_Client_ID varchar2(200);
column_name varchar2(20);
execute_feedback integer;
mal material_attribute_pre_load%
ROWTYPE;
local_var varchar2(200);
clienttab DBMS_SQL.DATE_TABLE;
client_column column_find := column_find();
-- Declare program variables as shown above
BEGIN
--client_column := column_find();
v_c_hndl := DBMS_SQL.OPEN_CURSOR;
while i < 999
LOOP
i := i + 1;
client_column.EXTEND;
client_column(i) := CONCAT('c',i);
dbms_output.put_line(client_column(i));
BEGIN
dbms_output.put_line('Starting SQL_STMT.');
v_SQL_STMT := 'SELECT :column_name FROM
MATERIAL_ATTRIBUTE_PRE_LOAD WHERE :column_name2 = :v_Client_ID';
dbms_output.put_line('Starting DBMS_SQL.PARSE.');
DBMS_SQL.PARSE(v_c_hndl,v_SQL_STMT,DBMS_SQL.NATIVE);
dbms_output.put_line('Starting DBMS_SQL.BIND_VARIABLE.');
DBMS_SQL.BIND_VARIABLE
(v_c_hndl,'v_Client_ID','Client ID');
DBMS_SQL.BIND_VARIABLE
(v_c_hndl,'column_name',client_column(i));
DBMS_SQL.BIND_VARIABLE
(v_c_hndl,'column_name2',client_column(i));
dbms_output.put_line('Starting DBMS_SQL.DEFINE_ARRAY.');
DBMS_SQL.DEFINE_ARRAY(v_c_hndl,1,clienttab,999,1);
execute_feedback := DBMS_SQL.EXECUTE_AND_FETCH
(v_c_hndl);
DBMS_SQL.CLOSE_CURSOR(v_c_hndl);
dbms_output.put_line
EXCEPTION
WHEN OTHERS THEN
v_errorcode := SQLCODE;
v_errortext := SUBSTR(SQLERRM,1,200);
dbms_output.put_line('DISPLAY_ERROR'||SUBSTR(TO_CHAR
(v_errorcode)||v_errortext,1,30));
END;
END LOOP;
EXCEPTION
WHEN OTHERS THEN
v_errorcode := SQLCODE;
v_errortext := SUBSTR(SQLERRM,1,200);
dbms_output.put_line('DISPLAY_ERROR'||SUBSTR(TO_CHAR
(v_errorcode)||v_errortext,1,30));
END; -- Procedure COLUMN_FIND

Answer 1

I'm using Oracle Database Express edition (latest version from the website afaik), logging into the web interface (using unique account I created after setup[not System], gave it All rights), clicking on SQL > SQL Commands > Enter commands.
I can't run each insert individually, that is only 1 table out of 8 tables, and I probably need to be able to run the entire script (which is actually headed by a sequence of Drop Table commands) sometimes, to refresh the data back to original values in case I stuff things up. The code was originally provided in a text file called bookscript.sql, but I haven't had any success importing or uploading that file into Oracle XE, if I use SQL > SQL Scripts > Upload, the file uploads, I then click on it and click on Run, but nothing seems to happen. (File is shared [read-only] here: https://docs.google.com/leaf?id=0B7IgBXIBNxw3OTY1ZTdmNGQtMjEwYi00YmRmLTkwZjItODZkYmYxODNkMTk4&hl=en_US).
Would love any guidance as to how to modify my environment or how to input the code differently to get it running, it works fine in the hosted environment at Uni, it's an Oracle class (textbook is Guide to Oracle 10g). Lecturer doesn't seem to know much about setting up Oracle, only working in a functioning environment.