[Pettersen]

Here:
echo Executing Server Config...
lanmode 0
rcon_password
maxplayers 50
port 7777
hostname
gamemode0 1
announce 1
query 1
chatlogging 1
weburl www.sa-mp.com
onfoot_rate 40
incar_rate 40
weapon_rate 40
stream_distance 300.0
stream_rate 1000
maxnpc 0
logtimeformat [%H:%M:%S]

You see maxnpc in server.cfg?
Change that, That is max npcs.