Tesselating block model

Incomplete without a crash report from ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]). Please attach it so that we can diagnose your issue.

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I have a crash report for that error though the game said it thought my game was modded (only 1 resource pack added):

Minecraft Crash Report ----
// You're mean.

Time: 23.07.14 20:38
Description: Tesselating block model

java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at csu.b(SourceFile:88)
at chc.a(SourceFile:156)
at cjs.a(SourceFile:139)
at cjs.a(SourceFile:81)
at cjs.a(SourceFile:43)
at cjs.a(SourceFile:35)
at cjq.a(SourceFile:62)
at cmt.b(SourceFile:156)
at cmm.a(SourceFile:71)
at cmm.run(SourceFile:31)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at csu.b(SourceFile:88)
at chc.a(SourceFile:156)
at cjs.a(SourceFile:139)
at cjs.a(SourceFile:81)

– Block model being tesselated –
Details:
Block: minecraft:leaves2[check_decay=false,decayable=true,variant=dark_oak]
Block location: World: (47,76,407), Chunk: (at 15,4,7 in 2,25; contains blocks 32,0,400 to 47,255,415), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Using AO: true
Stacktrace:
at cjs.a(SourceFile:43)
at cjs.a(SourceFile:35)

– Block being tesselated –
Details:
Block type: ID #161 (tile.leaves // axc)
Block data value: 1 / 0x1 / 0b0001
Block location: World: (47,76,407), Chunk: (at 15,4,7 in 2,25; contains blocks 32,0,400 to 47,255,415), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
at cjq.a(SourceFile:62)
at cmt.b(SourceFile:156)
at cmm.a(SourceFile:71)
at cmm.run(SourceFile:31)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w30b
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 323106016 bytes (308 MB) / 683671552 bytes (652 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94

Duplicate of MC-62984.

In the future you must include the complete crash report, don't cut of the part that shows the status of resource packs or other things, it will invalidate the ticket. Also, you can only report tickets on a pure vanilla setup, and that includes using the default resource pack.

I didn't have any ressource pack enabled just had one in the folder.
Here's the report:

________________________________________

crash-2014-07-23_20.38.48-client

Minecraft Crash Report ----
// You're mean.

Time: 23.07.14 20:38
Description: Tesselating block model

java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at csu.b(SourceFile:88)
at chc.a(SourceFile:156)
at cjs.a(SourceFile:139)
at cjs.a(SourceFile:81)
at cjs.a(SourceFile:43)
at cjs.a(SourceFile:35)
at cjq.a(SourceFile:62)
at cmt.b(SourceFile:156)
at cmm.a(SourceFile:71)
at cmm.run(SourceFile:31)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at java.util.ArrayList.rangeCheck(Unknown Source)
at java.util.ArrayList.get(Unknown Source)
at csu.b(SourceFile:88)
at chc.a(SourceFile:156)
at cjs.a(SourceFile:139)
at cjs.a(SourceFile:81)

– Block model being tesselated –
Details:
Block: minecraft:leaves2[check_decay=false,decayable=true,variant=dark_oak]
Block location: World: (47,76,407), Chunk: (at 15,4,7 in 2,25; contains blocks 32,0,400 to 47,255,415), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Using AO: true
Stacktrace:
at cjs.a(SourceFile:43)
at cjs.a(SourceFile:35)

– Block being tesselated –
Details:
Block type: ID #161 (tile.leaves // axc)
Block data value: 1 / 0x1 / 0b0001
Block location: World: (47,76,407), Chunk: (at 15,4,7 in 2,25; contains blocks 32,0,400 to 47,255,415), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
at cjq.a(SourceFile:62)
at cmt.b(SourceFile:156)
at cmm.a(SourceFile:71)
at cmm.run(SourceFile:31)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w30b
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.7.0_55, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 323106016 bytes (308 MB) / 683671552 bytes (652 MB) up to 954728448 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94

Also I didn't create the report so I can't attach the file, sorry. Report was complete though. Didn't have the ressource pack activated.