Help with how to convert a string to a number ??

Hi All,
I am having problem converting a string to number.
Looks like my to_number function is not working.
Help is very much appreciated.
My query is below, and I know my problem is in my inner query.
I am getting the following error:
what am I doing wrong ? and how should I fix it.
If there is a better approach, please share it.
ORA-01722: invalid number
01722. 00000 - "invalid number"
*Cause:
*Action:
SELECT
    A.OBJECT_NAME,
    A.TIMESTAMP,
    A.SESSION_ID,
    A.REQUISITION_ID,
    TO_DATE(CUT(RR_PACE_FUNCTIONS.NAME(A.REQUISITION_ID),3,'.'),'YYYYMMDD') CSD,
    SUBSTR(SUBSTR(RR_PACE_FUNCTIONS.DESCRIPTION(A.REQUISITION_ID),9),1,30) COURSE_ID,
    A.WEEK_GROUP,
    A.APTITUDE_AREA,
    SUM(NVL(GTEP_ASGN,0)) GTEP_ASGN,
    SUM(NVL(AI_ASGN,0)) AI_ASGN,
    SUM(NVL(GTEP_ASGN,0) + NVL(AI_ASGN,0) ) BMT_ASGN
FROM
    (SELECT OBJECT_NAME,
      SESSION_ID,
      TIMESTAMP,
      TO_NUMBER(FIELD1) REQUISITION_ID, -- I believe here is the problem
      TO_NUMBER(FIELD2) WEEK_GROUP,     -- here as well
      SUBSTR(FIELD3,1,80) APTITUDE_AREA,
      TO_NUMBER(FIELD4) GTEP_ASGN, -- here
      TO_NUMBER(FIELD5) AI_ASGN      -- here
    FROM RR_REPORT_QUEUES
    ) A
GROUP BY OBJECT_NAME,
    TIMESTAMP,
    SESSION_ID,
    WEEK_GROUP,
    APTITUDE_AREA,
    REQUISITION_ID ;Many Thanks,

Are you sure Field1, Field2, Field4 and Field5 contain a number information in all rows?
If there is a non numeric String in your Field<x> columns in any row the error will occor.

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