My Minecraft gets stuck on "building terrain" then crashes! HELP

Please attach the crash report found in [.minecraft|http://hopper.minecraft.net/help/guides/finding-minecraft-data-folder/]/crash-reports/crash-DATE-client.txt.

I'm sorry but how do I access that? do I search .minecraft in my folders or something?

Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 10/21/16 6:14 PM
Description: Updating screen events

java.lang.IndexOutOfBoundsException: Index: 49, Size: 46
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at net.minecraft.vb.d.a(d.java:242)
at net.minecraft.client.a.e.a(e.java:44)
at net.minecraft.client.r.e.a(e.java:351)
at net.minecraft.client.r.e.a(e.java:304)
at net.minecraft.client.r.e.a(e.java:88)
at net.minecraft.client.g.w.e(w.java:10)
at net.minecraft.client.g.w.c(w.java:38)
at net.minecraft.client.hb.F(hb.java:1404)
at net.minecraft.client.hb.q(hb.java:1103)
at net.minecraft.client.hb.a(hb.java:376)
at net.minecraft.client.main.Main.main(Main.java:9)

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

– Head –
Thread: Client thread
Stacktrace:
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at net.minecraft.vb.d.a(d.java:242)
at net.minecraft.client.a.e.a(e.java:44)
at net.minecraft.client.r.e.a(e.java:351)
at net.minecraft.client.r.e.a(e.java:304)
at net.minecraft.client.r.e.a(e.java:88)
at net.minecraft.client.g.w.e(w.java:10)
at net.minecraft.client.g.w.c(w.java:38)

– Affected screen –
Details:
Screen name: ~_ERROR~ NullPointerException: null

– Affected level –
Details:
Level name: MpServer
All players: 27 total; [sl['Sindersa'/252656, l='MpServer', x=-2563.01, y=52.80, z=745.80], b['Canista'/86126, l='MpServer', x=-2563.00, y=52.00, z=744.97], b['Alexia1116'/86263, l='MpServer', x=-2562.50, y=52.00, z=744.50], b['Spart_GuNN'/86349, l='MpServer', x=-2561.59, y=52.00, z=745.13], b['AbruTaba'/86358, l='MpServer', x=-2563.28, y=52.00, z=744.53], b['TheRadGhostYT'/86361, l='MpServer', x=-2563.44, y=52.00, z=745.06], b['DiGuin0'/86364, l='MpServer', x=-2568.42, y=53.00, z=733.56], b['pokemanmaster567'/86370, l='MpServer', x=-2563.56, y=55.00, z=745.88], b['KunFuPenguin'/86373, l='MpServer', x=-2544.94, y=49.80, z=743.31], b['MaddiieHatter'/86389, l='MpServer', x=-2562.44, y=52.00, z=745.44], b['IScavengeMC'/86404, l='MpServer', x=-2561.66, y=55.00, z=745.09], b['ZeusCraftZika'/86407, l='MpServer', x=-2561.25, y=52.00, z=744.47], b['GreenLightLED'/86413, l='MpServer', x=-2563.97, y=55.00, z=743.88], b['vNathan'/86416, l='MpServer', x=-2562.63, y=52.00, z=746.00], b['SkylenRose'/85756, l='MpServer', x=-2562.50, y=52.00, z=743.69], b['EHsuper8gamer'/85845, l='MpServer', x=-2562.28, y=52.00, z=745.06], b['Ma_names_jeff'/85877, l='MpServer', x=-2562.56, y=55.00, z=743.59], b['ninog'/86419, l='MpServer', x=-2563.91, y=55.00, z=743.53], b['shadowterrence'/86341, l='MpServer', x=-2573.59, y=47.97, z=725.78], b['iDeemo'/86209, l='MpServer', x=-2545.09, y=50.00, z=725.34], b['FireLilyDesigns'/86193, l='MpServer', x=-2540.97, y=50.00, z=737.16], b['NEGR1M'/86212, l='MpServer', x=-2537.56, y=50.00, z=747.97], b['PrivateCloobs'/86328, l='MpServer', x=-2538.23, y=50.17, z=748.05], b['xSkilledSniperx'/86008, l='MpServer', x=-2534.41, y=50.00, z=742.66], b['philgreek'/86386, l='MpServer', x=-2555.61, y=52.36, z=775.44], b['DeltaDaveMC'/84908, l='MpServer', x=-2568.82, y=77.63, z=755.63], b['ArthurPvP_3016'/84060, l='MpServer', x=-2534.50, y=54.22, z=715.00]]
Chunk stats: MultiplayerChunkCache: 169, 169
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-2564,55,745), Chunk: (at 12,3,9 in -161,46; contains blocks -2576,0,736 to -2561,255,751), Region: (-6,1; contains chunks -192,32 to -161,63, blocks -3072,0,512 to -2561,255,1023)
Level time: 1042288999 game time, 264500 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: 89 total; [sl['Sindersa'/252656, l='MpServer', x=-2563.01, y=52.80, z=745.80], b['Canista'/86126, l='MpServer', x=-2563.00, y=52.00, z=744.97], b['Alexia1116'/86263, l='MpServer', x=-2562.50, y=52.00, z=744.50], b['Spart_GuNN'/86349, l='MpServer', x=-2561.59, y=52.00, z=745.13], b['AbruTaba'/86358, l='MpServer', x=-2563.28, y=52.00, z=744.53], b['TheRadGhostYT'/86361, l='MpServer', x=-2563.44, y=52.00, z=745.06], b['IScavengeMC'/86404, l='MpServer', x=-2561.66, y=55.00, z=745.09], b['DiGuin0'/86364, l='MpServer', x=-2568.42, y=53.00, z=733.56], b['ZeusCraftZika'/86407, l='MpServer', x=-2561.25, y=52.00, z=744.47], b['pokemanmaster567'/86370, l='MpServer', x=-2563.56, y=55.00, z=745.88], n['Villager'/7, l='MpServer', x=-2573.38, y=67108863.97, z=773.31], b['KunFuPenguin'/86373, l='MpServer', x=-2544.94, y=49.80, z=743.31], g['Armor Stand'/8, l='MpServer', x=-2550.31, y=48.59, z=728.78], b['MaddiieHatter'/86389, l='MpServer', x=-2562.44, y=52.00, z=745.44], g['Armor Stand'/9, l='MpServer', x=-2544.78, y=49.59, z=729.09], b['IScavengeMC'/86404, l='MpServer', x=-2561.66, y=55.00, z=745.09], g['Armor Stand'/10, l='MpServer', x=-2544.50, y=49.59, z=734.88], b['ZeusCraftZika'/86407, l='MpServer', x=-2561.25, y=52.00, z=744.47], g['Armor Stand'/11, l='MpServer', x=-2548.88, y=49.59, z=738.78], b['GreenLightLED'/86413, l='MpServer', x=-2563.97, y=55.00, z=743.88], b['GreenLightLED'/86413, l='MpServer', x=-2563.97, y=55.00, z=743.88], e['entity.ItemFrame.name'/12, l='MpServer', x=-2553.50, y=55.50, z=776.97], b['vNathan'/86416, l='MpServer', x=-2562.63, y=52.00, z=746.00], e['entity.ItemFrame.name'/13, l='MpServer', x=-2552.50, y=55.50, z=776.97], b['SkylenRose'/85756, l='MpServer', x=-2562.50, y=52.00, z=743.69], e['entity.ItemFrame.name'/14, l='MpServer', x=-2551.50, y=55.50, z=776.97], b['EHsuper8gamer'/85845, l='MpServer', x=-2562.28, y=52.00, z=745.06], e['entity.ItemFrame.name'/15, l='MpServer', x=-2547.50, y=54.50, z=776.97], b['Ma_names_jeff'/85877, l='MpServer', x=-2562.56, y=55.00, z=743.59], e['entity.ItemFrame.name'/16, l='MpServer', x=-2548.50, y=54.50, z=776.97], b['vNathan'/86416, l='MpServer', x=-2562.63, y=52.00, z=746.00], e['entity.ItemFrame.name'/17, l='MpServer', x=-2549.50, y=54.50, z=776.97], b['ninog'/86419, l='MpServer', x=-2563.91, y=55.00, z=743.53], e['entity.ItemFrame.name'/18, l='MpServer', x=-2545.50, y=55.50, z=776.97], e['entity.ItemFrame.name'/19, l='MpServer', x=-2544.50, y=55.50, z=776.97], e['entity.ItemFrame.name'/20, l='MpServer', x=-2545.50, y=52.50, z=776.97], l['§8Lv§7001 §rCat: Siamese'/86420, l='MpServer', x=-2570.32, y=51.91, z=746.69], e['entity.ItemFrame.name'/21, l='MpServer', x=-2551.50, y=52.50, z=776.97], g['Armor Stand'/22, l='MpServer', x=-2532.94, y=50.09, z=728.66], g['Armor Stand'/23, l='MpServer', x=-2538.50, y=49.59, z=729.38], g['Armor Stand'/24, l='MpServer', x=-2543.56, y=49.59, z=739.25], b['ninog'/86419, l='MpServer', x=-2563.91, y=55.00, z=743.53], e['entity.ItemFrame.name'/25, l='MpServer', x=-2543.50, y=55.50, z=776.97], g['§f1 Available!§r'/86427, l='MpServer', x=-2538.50, y=53.69, z=736.50], b['shadowterrence'/86341, l='MpServer', x=-2573.59, y=47.97, z=725.78], g['§f1 Available!§r'/86428, l='MpServer', x=-2538.50, y=53.69, z=752.50], b['iDeemo'/86209, l='MpServer', x=-2545.09, y=50.00, z=725.34], b['TheRobin_Z'/86185, l='MpServer', x=-2531.63, y=51.50, z=723.88], g['§bMystery Vault'/167, l='MpServer', x=-2538.50, y=53.38, z=736.50], b['FireLilyDesigns'/86193, l='MpServer', x=-2540.97, y=50.00, z=737.16], g['§e§lRIGHT CLICK'/168, l='MpServer', x=-2538.50, y=53.09, z=736.50], b['NEGR1M'/86212, l='MpServer', x=-2537.56, y=50.00, z=747.97], b['PrivateCloobs'/86328, l='MpServer', x=-2538.23, y=50.17, z=748.05], g['§bMystery Vault'/169, l='MpServer', x=-2538.50, y=53.38, z=752.50], b['DeltaDaveMC'/84908, l='MpServer', x=-2568.82, y=77.63, z=755.63], g['§e§lRIGHT CLICK'/170, l='MpServer', x=-2538.50, y=53.09, z=752.50], n['Villager'/171, l='MpServer', x=-2557.50, y=52.00, z=747.50], b['xSkilledSniperx'/86008, l='MpServer', x=-2534.41, y=50.00, z=742.66], g['§e§lRIGHT CLICK§r'/172, l='MpServer', x=-2557.50, y=54.16, z=747.50], g['§bQuest Master§r'/173, l='MpServer', x=-2557.50, y=54.47, z=747.50], b['DeltaDaveMC'/84908, l='MpServer', x=-2568.82, y=77.63, z=755.63], b['FireLilyDesigns'/86193, l='MpServer', x=-2540.97, y=50.00, z=737.16], b['PrivateCloobs'/86328, l='MpServer', x=-2538.23, y=50.17, z=748.05], b['iDeemo'/86209, l='MpServer', x=-2545.09, y=50.00, z=725.34], d['§8Lv§7001 §rwannaSkype'/86213, l='MpServer', x=-2538.44, y=50.00, z=748.38], b['shadowterrence'/86341, l='MpServer', x=-2573.59, y=47.97, z=725.78], b['NEGR1M'/86212, l='MpServer', x=-2537.56, y=50.00, z=747.97], b['Spart_GuNN'/86349, l='MpServer', x=-2561.59, y=52.00, z=745.13], b['philgreek'/86386, l='MpServer', x=-2555.61, y=52.36, z=775.44], b['EHsuper8gamer'/85845, l='MpServer', x=-2562.28, y=52.00, z=745.06], b['AbruTaba'/86358, l='MpServer', x=-2563.28, y=52.00, z=744.53], b['TheRadGhostYT'/86361, l='MpServer', x=-2563.44, y=52.00, z=745.06], b['DiGuin0'/86364, l='MpServer', x=-2568.42, y=53.00, z=733.56], b['ArthurPvP_3016'/84060, l='MpServer', x=-2534.50, y=54.22, z=715.00], b['pokemanmaster567'/86370, l='MpServer', x=-2563.56, y=55.00, z=745.88], b['KunFuPenguin'/86373, l='MpServer', x=-2544.94, y=49.80, z=743.31], b['ArthurPvP_3016'/84060, l='MpServer', x=-2534.50, y=54.22, z=715.00], b['Canista'/86126, l='MpServer', x=-2563.00, y=52.00, z=744.97], g['§e§lParkour Challenge'/113, l='MpServer', x=-2577.50, y=46.34, z=724.50], g['§a§lStart'/114, l='MpServer', x=-2577.50, y=46.00, z=724.50], b['philgreek'/86386, l='MpServer', x=-2555.61, y=52.36, z=775.44], b['MaddiieHatter'/86389, l='MpServer', x=-2562.44, y=52.00, z=745.44], b['Ma_names_jeff'/85877, l='MpServer', x=-2562.56, y=55.00, z=743.59], g['§e§lCheckpoint'/117, l='MpServer', x=-2564.50, y=20.34, z=758.50], b['Alexia1116'/86263, l='MpServer', x=-2562.50, y=52.00, z=744.50], g['§b§l#1'/118, l='MpServer', x=-2564.50, y=20.00, z=758.50], b['Bewwa'/86175, l='MpServer', x=-2531.18, y=52.00, z=718.31], b['xSkilledSniperx'/86008, l='MpServer', x=-2534.41, y=50.00, z=742.66], b['SkylenRose'/85756, l='MpServer', x=-2562.50, y=52.00, z=743.69]]
Retry entities: 0 total; []
Server brand: BungeeCord (Hypixel) <- vanilla
Server type: Non-integrated multiplayer server
Stacktrace:
at net.minecraft.client.a.m.a(m.java:75)
at net.minecraft.client.hb.c(hb.java:1242)
at net.minecraft.client.hb.a(hb.java:1191)
at net.minecraft.client.main.Main.main(Main.java:9)

– System Details –
Details:
Minecraft Version: 1.10.2
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 156575312 bytes (149 MB) / 325660672 bytes (310 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Launched Version: huzuni
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.4358, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: Yes
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Resource Packs: Eum3s PvP Faithful Edit 1.8 (2).zip (incompatible)
Current Language: English (US)
Profiler Position: N/A (disabled)
CPU: 4x Intel(R) Core(TM) i5-3360M CPU @ 2.80GHz
OptiFine Version: OptiFine_1.10.2_HD_U_C2
Render Distance Chunks: 12
Mipmaps: 4
Anisotropic Filtering: 1
Antialiasing: 0
Multitexture: false
Shaders: null
OpenGlVersion: 4.0.0 - Build 10.18.10.4358
OpenGlRenderer: Intel(R) HD Graphics 4000
OpenGlVendor: Intel
CpuCount: 4

that's a copy and paste of what it says in %APPDATA% .minecraft and crash reports.

Thank you for your report!
However, this issue has been closed as Invalid.

Your Minecraft version is outdated. We currently take issues for version 1.12 or the latest snapshot.
Please update to the latest version as it includes the newest fixes. If you still have this problem after updating, then please create a new issue.
In case of a game crash, please also attach the crashlog.

Your game, launcher or server is modified.
If you can reproduce the issue in a vanilla environment, please recreate the issue.

• Any non-standard client/server/launcher build needs to be taken up with the appropriate team, not Mojang.

• Any plugin issues need to be addressed to the creator of the plugin or resource pack.

• If you have problems on large servers, such as The Hive and Hypixel, please contact them first as they run modified server software.

Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki

I added the crash report in a new "create", so that way its there for you. Please respond so I know if it worked or not!