Problem/Bug Silk Spawners / Spawners on my server not spawning anything

Here is my console error (It's probably being spammed, sorry for my horrid copy/pasting)
http://pastebin.com/nF0yVAxf

My Silk Spawners Config:

Silk Spawners Config (open) Silk Spawners Config (close)

# See documentation at http://dev.bukkit.org/bukkit-plugins/silkspawners/pages/configuration
# Should the plugin automatically update if an update is available?
autoUpdater: true
# Should permissions be used
usePermissions: true
# Should a permission be required when a spawner explodes by TNT to achieve a drop
permissionExplode: false
# Should be checked for WorldGuard build ability to change spawners
useWorldGuard: true
# Percentage of dropping a spawner block when TNT or creepers explode
explosionDropChance: 30
# Percentage of dropping a iron bars when a spawner is mined
destroyDropChance: 100
# Percentage of dropping an egg when a spawner is mined
eggDropChance: 100
# Percentage of dropping the spawner when mined
silkDropChance: 100
# When generic spawner items are placed, spawn this creature (e.g. from /give or other plugins)
# PIG (90) is Minecraft default (put NAMES or IDs here!)
defaultCreature: 90
# How far is the spawner reachable with your crosshair (disable with -1)
spawnerCommandReachDistance: 6
# Minimum silk touch level [can be changed via other plugins to a higher value]
# Set it to 0 to mine it without silk touch
minSilkTouchLevel: 1
# If a player in creative destroys a spawner nothing is dropped
noDropsCreative: true
# If a spawner is destroyed, should the egg be dropped
destroyDropEgg: false
# If a spawner is destroyed, should XP be dropped
destroyDropXP: 0
# Flag a spawner as already mined to prevent XP duping
preventXPFarming: true
#Drops XP only when a spawner is destroyed and not mined via SilkTouch
dropXPOnlyOnDestroy: false
# If a spawner is destroyed, should iron bars be dropped
destroyDropBars: 0
# Should the player be able to craft spawners
craftableSpawners: false
# Leave a slot empty (null/air)? Just make a space then, example 'A A' -> middle is free
# X is always the egg
recipeTop: AAA
recipeMiddle: AXA
recipeBottom: AAA
recipeAmount: 1
# Custom example:
#recipeTop: 'A A'
#recipeMiddle: 'BXA'
#recipeBottom: 'C D'
#ingredients:
# - 'A,IRON_FENCE'
# - 'B,DIRT'
# - 'C,2'
# - 'D,5'
# You can put IDs or the NAME here (please uppercase)
# Add it for each custom ingredient you add, too!
ingredients:
- A,IRON_FENCE
# Should spawners be stackable
spawnersUnstackable: false
# Should the egg be consumed when the spawner is changed with it
consumeEgg: true
# Fallback if the creature should be enabled, if not specified for the entity
enableCreatureDefault: true
# Should numbers be ignored (on eggs) and allow every number value?
ignoreCheckNumbers: false
# Should instead of spawning a mob a MonsterSpawner be placed? (Uses consumeEgg value, too)
spawnEggToSpawner: false
# Should the spawn algorithm be overridden? Allows spawning of non-standard entities
spawnEggOverride: false
# Fallback if the creature should be spawned, if not specified for the entity
spawnEggOverrideSpawnDefault: true
# Notify the player about the spawner when he clicks it in the inventory
notifyOnClick: true
# Notify the player about the spawner when he holds the spawner in the hand
notifyOnHold: true
# Configure displaying with BarAPI, time is in seconds
barAPI:
enable: true
displayTime: 3
# Puts more information out on startup
verboseConfig: false
# Internal stuff, do NOT change unless advised - the plugin might break otherwise
useReflection: true
testMCVersion: true
useMetadata: true
useLegacyName: false

Quick note: I wouldn't completely blame this on the plugin, because even with the plugin uninstalled nothing spawns from spawners

In my server.properties, both mob and monster spawning is enabled.

The only plugin I have that could affect mob spawning is SilkSpawners

Please reply ASAP if you can help!