When fiddling around with gates and wires in creative mode this exception happend. Game world can not be started any more.

Game world data can be downloaded here (1.5 MB)
https://www.dropbox.com/s/xn3jdpzw4m5ya5x/New%20World.7z?dl=0

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 29.11.14 12:42
Description: Ticking block entity

java.lang.ClassCastException: buildcraft.api.statements.StatementParameterItemStack cannot be cast to buildcraft.transport.statements.TriggerParameterSignal
at buildcraft.transport.statements.TriggerPipeSignal.isTriggerActive(TriggerPipeSignal.java:66)
at buildcraft.transport.Gate.isTriggerActive(Gate.java:520)
at buildcraft.transport.Gate.resolveActions(Gate.java:412)
at buildcraft.transport.Pipe.updateEntity(Pipe.java:215)
at buildcraft.transport.pipes.PipeItemsWood.updateEntity(PipeItemsWood.java:106)
at buildcraft.transport.TileGenericPipe.func_145845_h(TileGenericPipe.java:383)
at net.minecraft.world.World.func_72939_s(World.java:1939)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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

-- Head --
Stacktrace:
at buildcraft.transport.statements.TriggerPipeSignal.isTriggerActive(TriggerPipeSignal.java:66)
at buildcraft.transport.Gate.isTriggerActive(Gate.java:520)
at buildcraft.transport.Gate.resolveActions(Gate.java:412)
at buildcraft.transport.Pipe.updateEntity(Pipe.java:215)
at buildcraft.transport.pipes.PipeItemsWood.updateEntity(PipeItemsWood.java:106)
at buildcraft.transport.TileGenericPipe.func_145845_h(TileGenericPipe.java:383)

-- Block entity being ticked --
Details:
Name: net.minecraft.src.buildcraft.transport.GenericPipe // buildcraft.transport.TileGenericPipe
Block type: ID #167 (tile.pipeBlock // buildcraft.transport.BlockGenericPipe)
Block data value: 2 / 0x2 / 0b0010
Block location: World: (-2,237,18), Chunk: (at 14,14,2 in -1,1; contains blocks -16,0,16 to -1,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Actual block type: ID #167 (tile.pipeBlock // buildcraft.transport.BlockGenericPipe)
Actual block data value: 2 / 0x2 / 0b0010
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1939)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:489)

-- Affected level --
Details:
Level name: New World
All players: 0 total; []
Chunk stats: ServerChunkCache: 625 Drop: 0
Level seed: 3227974303330554972
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 2;7,230x1,5x3,2;3;stronghold,biome_1,decoration,dungeon,mineshaft
Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 9589 game time, 9589 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 8998 (now: false), thunder time: 56047 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:636)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 7 (x86) version 6.1
Java Version: 1.7.0_71, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 171782992 bytes (163 MB) / 478334976 bytes (456 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.05 FML v7.10.85.1232 Minecraft Forge 10.13.2.1232 14 mods loaded, 14 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1232} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1232} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.3.28} CodeChicken Core Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
NotEnoughItems{1.0.3.60} Not Enough Items Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{6.2.0} BuildCraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{6.2.0} BC Transport Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{6.2.0} BC Silicon Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{6.2.0} BC Builders Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{6.2.0} BC Energy Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{6.2.0} BC Factory Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
craftguide{1.6.8.1} CraftGuide Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Railcraft{9.4.0.0} Railcraft Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
voxelmap{1.7.10} VoxelMap No Radar Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Already fixed in 6.2.1. Give me a while to release it, shouldn't take long (a few hours?)