Not found - The requested URL /apex/wwv_flow.show was not found on this ser

Question

I have a very simple anonymous block (see below) which I am using to test an area of the database I am developing using OE and APEX. Sometimes the block works and other times it fails with the following error message------
Not found - The requested URL /apex/wwv_flow.show was not found on this server
Before the error message is displayed a pop-up window appears with a submit button ( the heading on the window contains --- Enter Bind Variables - windows internet explorer), which I do not understand.
Is the problem I am experiencing due to some memory limitation ? or do I have a corrupt oracle system (everything else appears OK though).
Any help or advice would be much appreciated.
Best Regards
Lawrence Cattell
Here is the anonymous block (please no comments on the code). If I extend the number of DBMS_OUTPUT.PUT_LINES beyond the current number of 3 it fails everytime, sometimes it works with 3, sometimes it fails. Is it related to the number of variables I am binding to the WSI_QUOTE Type ?
DECLARE
v_dir VARCHAR2(20):='WSI_REPORTS';
V_COUNT NUMBER(2,0);
V_QTE_REF_NBR WSI_QUOTES.QTE_REF_NBR%TYPE;
V_CTR_ID WSI_QUOTES.CTR_ID%TYPE;
v_QTE_REC_NBR WSI_QUOTES.QTE_REC_NBR%TYPE;
v_QTE_DTE WSI_QUOTES.QTE_DTE%TYPE;
V_PEB_NBR WSI_QUOTES.PEB_NBR%TYPE;
V_QTE_COM WSI_QUOTES.QTE_COM%TYPE;
V_SAI_NBR_01 WSI_QUOTES.SAI_NBR_01%TYPE;
V_QTY_01 WSI_QUOTES.QTY_01%TYPE;
V_SAI_NBR_02 WSI_QUOTES.SAI_NBR_02%TYPE;
V_QTY_02 WSI_QUOTES.QTY_02%TYPE;
V_SAI_NBR_03 WSI_QUOTES.SAI_NBR_03%TYPE;
V_QTY_03 WSI_QUOTES.QTY_03%TYPE;
V_SAI_NBR_04 WSI_QUOTES.SAI_NBR_04%TYPE;
V_QTY_04 WSI_QUOTES.QTY_04%TYPE;
V_SAI_NBR_05 WSI_QUOTES.SAI_NBR_05%TYPE;
V_QTY_05 WSI_QUOTES.QTY_05%TYPE;
V_SAI_NBR_06 WSI_QUOTES.SAI_NBR_06%TYPE;
V_QTY_06 WSI_QUOTES.QTY_06%TYPE;
V_SAI_NBR_07 WSI_QUOTES.SAI_NBR_07%TYPE;
V_QTY_07 WSI_QUOTES.QTY_07%TYPE;
V_SAI_NBR_08 WSI_QUOTES.SAI_NBR_08%TYPE;
V_QTY_08 WSI_QUOTES.QTY_08%TYPE;
V_SAI_NBR_09 WSI_QUOTES.SAI_NBR_09%TYPE;
V_QTY_09 WSI_QUOTES.QTY_09%TYPE;
V_SAI_NBR_10 WSI_QUOTES.SAI_NBR_10%TYPE;
V_QTY_10 WSI_QUOTES.QTY_10%TYPE;
V_CTR_NME WSI_CUSTOMERS.CTR_NME%TYPE;
CURSOR GET_QUOTE_INFO_CUR IS
SELECT *FROM WSI_QUOTES WHERE QTE_REC_NBR = 2;
BEGIN
DELETE WSI_QUOTE_TEMP_HOLD;
OPEN GET_QUOTE_INFO_CUR;
LOOP
FETCH GET_QUOTE_INFO_CUR INTO V_QTE_REC_NBR,V_QTE_REF_NBR,V_CTR_ID,v_QTE_DTE,V_PEB_NBR, V_SAI_NBR_01,V_QTY_01,V_SAI_NBR_02,V_QTY_02,V_SAI_NBR_03, V_QTY_03,
V_SAI_NBR_04, V_QTY_04, V_SAI_NBR_05, V_QTY_05,V_SAI_NBR_06, V_QTY_06,V_SAI_NBR_07,V_QTY_07,V_SAI_NBR_08, V_QTY_08, V_SAI_NBR_09, V_QTY_09,
V_SAI_NBR_10,V_QTY_10,V_QTE_COM;
EXIT WHEN GET_QUOTE_INFO_CUR%NOTFOUND;
SELECT CTR_NME INTO v_CTR_NME FROM WSI_CUSTOMERS WHERE CTR_ID = V_CTR_ID;
END LOOP;
CLOSE GET_QUOTE_INFO_CUR;
V_COUNT :=1;
DBMS_OUTPUT.PUT_LINE(v_QTE_REF_NBR|| '***' ||v_CTR_ID|| '***' ||V_CTR_NME|| '***' ||V_peb_NBR|| '***' ||V_SAI_NBR_01|| '***' ||V_QTY_01);
DBMS_OUTPUT.PUT_LINE(v_QTE_REF_NBR|| '***' ||v_CTR_ID|| '***' ||V_CTR_NME|| '***' ||V_peb_NBR|| '***' ||V_SAI_NBR_02|| '***' ||V_QTY_02);
DBMS_OUTPUT.PUT_LINE(v_QTE_REF_NBR|| '***' ||v_CTR_ID|| '***' ||V_CTR_NME|| '***' ||V_peb_NBR|| '***' ||V_SAI_NBR_03|| '***' ||V_QTY_03);
END;

Answer 1

The interpreter could be choking on the "*from" (no space before "from") might not be parsing the SQL as intended .
The "Enter Bind Variables" dialog box is coming from something undefined, I'd suggest putting that block into an .sql file and run it via sqlplus.
To demonstrate how a bind variable is handled try setting up a file with:
select * from sometablename where somecolname = &somekeyval;
-- or '&somekeyval' if its varchar2When you connect with sqlplus and run that file it will prompt for the value to use for "somekeyval".
Only other thing is to ensure the "select * ..." has the same column names and in the same order as expected by the fetch, perhaps the table layout has changed and you could be getting an added column or maybe missing one at the end of the list.
If you try running that block in a sqlplus session enable serveroutput to see the dbms_out result (set serveroutput on size 50000)