Debug?

[jollewhoever]

How shall i debug my applications??
I've tried GDB and all i get is this error:

___TERMINAL________________________________________________

[localhost:~] User% su root
Password:

[localhost:/Users/User] root# gdb /LaunchCFMapp
GNU gdb 5.1-20020125 (Apple version gdb-213) (Wed Apr 3 04:16:48 GMT 2002)
Copyright 2002 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "powerpc-apple-macos10".
Reading symbols for shared libraries .... done
(gdb) run /AFile
Starting program: /LaunchCFMapp /AFile
[Switching to process 401 thread 0x1603]
Reading symbols for shared libraries ............................................ done
Reading symbols for shared libraries . done
Launch failed with error code -2856

Program exited with code 0330.
(gdb) quit

[localhost:/Users/User] root#
____________________________________________________________

What should I do???

/Jolle