Please help me analysis it, Failed when CSV file upload to PSA,

Question

我的步骤是先建
1.DATASOURCE；
2.填写EXTACTION TAB的信息， 数据格式旋转CSV,数据分割输入代号u201D，u201C
3.在Proposal tab,点击加载数据，可以看到CSV里面的数据；
4,点击Fields Tab,就跳出对话框u201CField list no longer corresponds to default copy changesu201D "yes or no "
5.点击YES，在FIields tab 里面可以看到Field,desciption等信息
6.点击PREVIEW，就出现错误信息，
请大家帮忙分析一下错误原因在那里。
---Runtime error -description of exception;
Runtime errors Data_length_negative
Except. CX_XY_RANGE_OUT_OF_BOUNDS
short text Invailid partial field access :length negative
what happened Errpr in the ABAP application program
The current Abap program "CL_RSAR_PSA==============CP " has to be terminated bacause it has
come across a statement that unfortunately can't be executed.
Error analysis
An exception occured that is explained in detail below.
The exception,which is assigned to calss 'CX_SY_RANGE_OUT_OF_BOUNDS", was not caught in
Procedure "_GET_DDI_STRUCTURE" "METHOD)",nor was it propagated by a raising clause.
since the caller of the produre "method"...........

Answer 1

只有一行数据也还是报同样的错，
我刚刚开始学，不知道怎么DEBUG，能否简单说一下怎么DEBUG嘛？
谢谢。
－－－－下面是错误信息
Runtime Errors         DATA_LENGTH_NEGATIVE
Except.                CX_SY_RANGE_OUT_OF_BOUNDS
Date and Time          09/04/2009 21:34:14
Short text
Invalid partial field access: Length negative
What happened?
Error in the ABAP Application Program
The current ABAP program "CL_RSAR_PSA===================CP" had to be
terminated because it has
come across a statement that unfortunately cannot be executed.
What can you do?
Note down which actions and inputs caused the error.
To process the problem further, contact you SAP system
administrator.
Using Transaction ST22 for ABAP Dump Analysis, you can look
at and manage termination messages, and you can also
keep them for a long time.
Error analysis
An exception occurred that is explained in detail below.
The exception, which is assigned to class 'CX_SY_RANGE_OUT_OF_BOUNDS', was not
caught in
procedure "_GET_DDIC_STRUCTURE" "(METHOD)", nor was it propagated by a RAISING
clause.
Since the caller of the procedure could not have anticipated that the
exception would occur, the current program is terminated.
The reason for the exception is:
In the executed program "CL_RSAR_PSA===================CP", the system
attempted to access the field
"ME->P_PSA_TECHNAME" using the length "-3".
However, a partial field access with a negative length specification is
not allowed.
How to correct the error
Use a positive length specification if a part of the field "ME->P_PSA_TECHNAME"
is to be
accessed.
If the error occurred in your own ABAP program or in an SAP
program you modified, try to remove the error.
If the error occures in a non-modified SAP program, you may be able to
find an interim solution in an SAP Note.
If you have access to SAP Notes, carry out a search with the following
keywords:
"DATA_LENGTH_NEGATIVE" "CX_SY_RANGE_OUT_OF_BOUNDS"
"CL_RSAR_PSA===================CP" or "CL_RSAR_PSA===================CM00A"
"_GET_DDIC_STRUCTURE"
If you cannot solve the problem yourself and want to send an error
notification to SAP, include the following information:
1. The description of the current problem (short dump)
To save the description, choose "System->List->Save->Local File
(Unconverted)".
2. Corresponding system log
Display the system log by calling transaction SM21.
Restrict the time interval to 10 minutes before and five minutes
after the short dump. Then choose "System->List->Save->Local File
(Unconverted)".
3. If the problem occurs in a problem of your own or a modified SAP
program: The source code of the program
In the editor, choose "Utilities->More
Utilities->Upload/Download->Download".
4. Details about the conditions under which the error occurred or which
actions and input led to the error.
The exception must either be prevented, caught within proedure
"_GET_DDIC_STRUCTURE" "(METHOD)", or its possible occurrence must be declared
in the
RAISING clause of the procedure.
To prevent the exception, note the following: