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my minecraft crashed recently because of placing/breaking blocks in a mod, here is my report:

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 4/21/13 6:16 PM
Description: Ticking memory connection

java.lang.ClassCastException: net.minecraft.jammy780.furniture.tiles.jfm_TileEntityWoodBlocksTwo cannot be cast to net.minecraft.jammy780.furniture.tiles.jfm_TileEntityCeramicBlocksOne
at net.minecraft.jammy780.furniture.blocks.ceramic.jfm_CeramicBlocksOne.func_71852_a(jfm_CeramicBlocksOne.java:261)
at net.minecraft.world.chunk.Chunk.func_76592_a(Chunk.java:720)
at net.minecraft.world.World.func_72832_d(World.java:553)
at net.minecraft.world.World.func_94571_i(World.java:682)
at net.minecraft.block.Block.removeBlockByPlayer(Block.java:1625)
at net.minecraft.item.ItemInWorldManager.func_73079_d(ItemInWorldManager.java:275)
at net.minecraft.item.ItemInWorldManager.func_73084_b(ItemInWorldManager.java:308)
at net.minecraft.item.ItemInWorldManager.func_73074_a(ItemInWorldManager.java:170)
at net.minecraft.network.NetServerHandler.func_72510_a(NetServerHandler.java:491)
at net.minecraft.network.packet.Packet14BlockDig.func_73279_a(SourceFile:46)
at net.minecraft.network.MemoryConnection.func_74428_b(MemoryConnection.java:89)
at net.minecraft.network.NetServerHandler.func_72570_d(NetServerHandler.java:134)
at net.minecraft.network.NetworkListenThread.func_71747_b(NetworkListenThread.java:53)
at net.minecraft.server.integrated.IntegratedServerListenThread.func_71747_b(IntegratedServerListenThread.java:109)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:674)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:570)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:127)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:468)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)


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

-- System Details --
Details:
Minecraft Version: 1.5.1
Operating System: Windows XP (x86) version 5.1
Java Version: 1.7.0_11, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 341965792 bytes (326 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xmx1024M -Xms512M
AABB Pool Size: 3785 (211960 bytes; 0 MB) allocated, 3694 (206864 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
FML: MCP v7.44 FML v5.1.8.611 Minecraft Forge 7.7.1.611 7 mods loaded, 7 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
More Tools Mod [More Tools Mod] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TaleOfKingdoms [Tale of Kingdoms] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_TaleOfKingdoms [mod_TaleOfKingdoms] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
jammyfurniture [Jammy Furniture Mod] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 1078 (60368 bytes; 0 MB) allocated, 899 (50344 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['Player515'/321, l='Tale of Kingdoms', x=182.82, y=63.00, z=141.56]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge,fml'

I Have jammy furniture mod and tale of kingdoms, I have gotten the same crash around five to six times