Mobs dont spawn on my server!

Hello everyone!
I have some troubles on my server!
Mobs dont spawn!
essentials config:
spawn:
creeper: false
skeleton: false
spider: false
giant: false
zombie: false
slime: false
ghast: false
pig_zombie: false
enderman: false
cave_spider: false
silverfish: false
blaze: false
magma_cube: false
ender_dragon: false
pig: false
sheep: false
cow: false
chicken: false
squid: false
wolf: false
mushroom_cow: false
snowman: false
ocelot: false
iron_golem: false
villager: false
wither: false
bat: false
witch: false
horse: false




and spawn mob limit is 10 :/
Server properties:
#Minecraft server properties
#Sat Aug 06 18:15:57 CEST 2016
spawn-protection=16
query.port=25100
server-name=TheBoomSurvival
generator-settings=
force-gamemode=false
allow-nether=true
gamemode=0
enable-query=true
player-idle-timeout=0
difficulty=1
spawn-monsters=true
op-permission-level=4
announce-player-achievements=true
pvp=true
snooper-enabled=true
level-type=DEFAULT
hardcore=false
enable-command-block=true
max-players=20
rcon.port=25111
server-port=25111
debug=false
server-ip=5.9.67.181
spawn-npcs=true
allow-flight=false
level-name=world
view-distance=5
server-id=unnamed
resource-pack=
spawn-animals=true
white-list=false
rcon.password=promjenime
generate-structures=true
online-mode=false
max-build-height=256
level-seed=
enable-rcon=true
motd=\u00A77\u00A7l----\u00A76\u00A7l[\u00A74\u00A7lRedBull\u00A76\u00A7l]\u00A77\u00A7l---- \u00A77\u00A7l-->\u00A76\u00A7l[\u00A7a\u00A7lSURVIVAL\u00A76\u00A7L]\u00A77\u00A7L<-- \u00A77\u00A7l-->\u00A76\u00A7l[\u00A75\u00A7lSkyPvP\u00A76\u00A7L]\u00A77\u00A7L<--

I do /gamerule doMobSpawning true and dont work!