Description: Unexpected error

java.lang.NullPointerException
at com.buuz135.thaumicjei.event.ResearchManager.sync(ResearchManager.java:73)
at com.buuz135.thaumicjei.event.ResearchManager.onTick(ResearchManager.java:60)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_565_ResearchManager_onTick_ClientTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:90)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:182)
at net.minecraftforge.fml.common.FMLCommonHandler.onPostClientTick(FMLCommonHandler.java:348)
at net.minecraft.client.Minecraft.runTick(Minecraft.java:1910)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1097)
at net.minecraft.client.Minecraft.run(Minecraft.java:3940)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Affected level --
Level name: MpServer
All players: 1 total; [EntityPlayerSP['xuexiaole'/1681, l='MpServer', x=222.97, y=64.00, z=255.21]]
Chunk stats: MultiplayerChunkCache: 305, 305
Level seed: 0
Level generator: ID 07 - BIOMESOP, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (196,64,252), Chunk: (at 4,4,12 in 12,15; contains blocks 192,0,240 to 207,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 21751 game time, 21751 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 41 total; [EntitySheep['羊'/1543, l='MpServer', x=158.25, y=69.00, z=292.89], EntityBat['蝙蝠'/1607, l='MpServer', x=285.33, y=51.46, z=210.57], EntitySheep['羊'/1544, l='MpServer', x=156.09, y=69.00, z=291.60], EntityBat['蝙蝠'/1608, l='MpServer', x=284.67, y=50.12, z=213.48], EntityPig['猪'/1545, l='MpServer', x=155.50, y=69.00, z=293.50], EntitySquid['鱿鱼'/1609, l='MpServer', x=273.36, y=59.74, z=255.68], EntityPig['猪'/1546, l='MpServer', x=153.50, y=69.00, z=294.50], EntitySquid['鱿鱼'/1610, l='MpServer', x=279.16, y=61.21, z=286.22], EntityPig['猪'/1547, l='MpServer', x=153.78, y=69.00, z=298.33], EntitySquid['鱿鱼'/1611, l='MpServer', x=284.27, y=62.24, z=293.83], EntitySheep['羊'/1548, l='MpServer', x=153.80, y=69.00, z=301.20], EntitySquid['鱿鱼'/1612, l='MpServer', x=278.36, y=62.19, z=296.09], EntityBat['蝙蝠'/1549, l='MpServer', x=161.58, y=26.01, z=216.61], EntitySheep['羊'/1613, l='MpServer', x=285.50, y=63.00, z=310.50], EntityBat['蝙蝠'/1550, l='MpServer', x=172.93, y=34.00, z=215.25], EntitySheep['羊'/1614, l='MpServer', x=280.73, y=67.00, z=312.49], EntitySheep['羊'/1551, l='MpServer', x=168.44, y=70.00, z=282.72], EntitySheep['羊'/1552, l='MpServer', x=160.45, y=69.00, z=280.72], EntitySheep['羊'/1553, l='MpServer', x=170.55, y=70.00, z=295.86], EntitySheep['羊'/1554, l='MpServer', x=161.43, y=69.00, z=295.75], EntityPig['猪'/1555, l='MpServer', x=161.23, y=69.00, z=293.44], EntityBat['蝙蝠'/1558, l='MpServer', x=179.61, y=31.91, z=214.31], EntityPlayerSP['xuexiaole'/1681, l='MpServer', x=222.97, y=64.00, z=255.21], EntityBat['蝙蝠'/1559, l='MpServer', x=183.36, y=44.03, z=240.42], EntityBat['蝙蝠'/1560, l='MpServer', x=190.79, y=44.29, z=243.68], EntitySheep['羊'/1561, l='MpServer', x=177.48, y=73.00, z=288.71], EntityBat['蝙蝠'/1568, l='MpServer', x=205.93, y=42.10, z=246.30], EntityBat['蝙蝠'/1569, l='MpServer', x=206.98, y=44.10, z=243.32], EntityBat['蝙蝠'/1570, l='MpServer', x=205.62, y=40.10, z=247.25], EntityBat['蝙蝠'/1571, l='MpServer', x=206.88, y=33.55, z=241.53], EntityBat['蝙蝠'/1578, l='MpServer', x=238.41, y=18.13, z=257.29], EntityBat['蝙蝠'/1579, l='MpServer', x=238.28, y=17.82, z=259.75], EntityBat['蝙蝠'/1580, l='MpServer', x=234.05, y=16.16, z=295.40], EntitySheep['羊'/1581, l='MpServer', x=229.73, y=69.00, z=312.50], EntitySheep['羊'/1582, l='MpServer', x=235.50, y=65.00, z=307.50], EntitySheep['羊'/1583, l='MpServer', x=235.60, y=64.00, z=317.20], EntitySheep['羊'/1585, l='MpServer', x=245.24, y=64.00, z=315.39], EntitySheep['羊'/1586, l='MpServer', x=246.50, y=63.00, z=324.50], EntitySheep['羊'/1587, l='MpServer', x=246.50, y=63.00, z=323.50], EntitySheep['羊'/1588, l='MpServer', x=247.50, y=62.10, z=327.50], EntitySheep['羊'/1589, l='MpServer', x=247.50, y=63.00, z=324.50]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server