1-First of all, i started the networkmanager service from system services and it keeps telling me at the shell prompt that no wireless network is found.It appears through the login prompt too.I am using runlevel 3 (Command prompt to login)
2-The network configuration option in the "setup" command just crashes.
Giving following msges




An unhandled exception has occured. This is most likely a bug. Please save the crash dump and file a detailed bug report against system-config-network at https://bugzilla.redhat.com/bugzilla
Component: system-config-network
Version: 1.3.95
Summary: TB /usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py:45:getDialog:TypeError: 'NoneType' object is not callable
Traceback (most recent call last):
File "/usr/sbin/system-config-network-tui", line 274, in ?
dev = selectDevice(screen)
File "/usr/sbin/system-config-network-tui", line 183, in selectDevice
if not dev.getDialog():
File "/usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py", line 45, in getDialog
dialog = _devWirelessDialog(self)
TypeError: 'NoneType' object is not callable

> /usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py(45)getDialog()
-> dialog = _devWirelessDialog(self)
(Pdb) Error in sys.excepthook:
Traceback (most recent call last):
File "/usr/sbin/system-config-network-tui", line 119, in <lambda>
PRG_NAME, PRG_VERSION)
File "/usr/sbin/system-config-network-tui", line 113, in handleException
pdb.post_mortem (tb)
File "/usr/lib/python2.4/pdb.py", line 1012, in post_mortem
p.interaction(t.tb_frame, t)
File "/usr/lib/python2.4/pdb.py", line 158, in interaction
self.cmdloop()
File "/usr/lib/python2.4/cmd.py", line 130, in cmdloop
line = raw_input(self.prompt)
KeyboardInterrupt

Original exception was:
Traceback (most recent call last):
File "/usr/sbin/system-config-network-tui", line 274, in ?
dev = selectDevice(screen)
File "/usr/sbin/system-config-network-tui", line 183, in selectDevice
if not dev.getDialog():
File "/usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py", line 45, in getDialog
dialog = _devWirelessDialog(self)
TypeError: 'NoneType' object is not callable
An unhandled exception has occured. This is most likely a bug. Please save the crash dump and file a detailed bug report against system-config-network at https://bugzilla.redhat.com/bugzilla
Component: system-config-network
Version: 1.3.95
Summary: TB /usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py:45:getDialog:TypeError: 'NoneType' object is not callable
Traceback (most recent call last):
File "/usr/sbin/system-config-network-tui", line 274, in ?
dev = selectDevice(screen)
File "/usr/sbin/system-config-network-tui", line 183, in selectDevice
if not dev.getDialog():
File "/usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py", line 45, in getDialog
dialog = _devWirelessDialog(self)
TypeError: 'NoneType' object is not callable

> /usr/share/system-config-network/netconfpkg/plugins/NCDevWireless.py(45)getDialog()
-> dialog = _devWirelessDialog(self)
(Pdb)


3-I am unable to add/remove packages.When i click add remove programs in the gnome menu, it starts up and the gives a msg " Unable to retrive software information" Details "Cannot find a valid baseurl for repo: core".
Please help
thanks in advance

First:
Change the distribution from "Fedora2" to "Fedora6" in your profile, I just turned the page when I seen that, then I saw "Fresh FC6 install" in the title and came back.
Second:
I hope you did as you were told and saved the "crash dump" as a .txt file and sent it to bugzilla so this problem can be taken care of for you and others with similar hardware/situations.
Third:
The reason yum says it cannot find a valid baseurl is because there is a problem with your network, and the most likely fix is to file a report at bugzilla and hand in the crash dump as an attachment.
Fourth:
Did you install kernel-devel and kernel-headers and compile drivers for your wireless network adapter? This is usually a pre-requisite to enabling wireless network connectivity.