[Asterisk-Users] Asterisk's Fails to start!

[Adnan Ahmed]

hi,
I am using TDM400 with FXS and FXO modules,everytime i run asterisk and 
looking asterisk log i found following errors:
parse error: No category context for line 96 of extensions.conf
Requested contexts didn't get merged

Also asterisk not run just initialize and freezes and the log shows 
above description.
my configs are:
zaptel.conf
fxoks=1
fxsks=4
loadzone=us
defaultzone=us

zapata.conf
[channels]
signalling=fxo_ks
context=outgoing
channel => 1

signalling=fxs_ks
context=incoming
channel => 4


extensions.conf
[incoming]
exten => s,1,Dial,Zap/1

[outgoing]
exten => _0NXXXXXX,1,Dial/1/${EXTEN:1}

I am a newbie so don't be bothering with my configuration.
kindly pointout my mistakes/errors and helping me out.