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Mods:
-Forge
-Forge API
-Modloader
-Ultimate API
-FlatBedrockLayer
-BetterWorldGeneration 4
-MoreVillageBiomes
-Rei's Minimap

All 1.5.1
Forge lastest

Problem: Upon starting a game it goes blank and "eats" any screen that is on it, cannot close it
normally, Ctrl Alt Del Gerenciator tool required to do it. Damn earth blocks.

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

Time: 28/03/13 13:11
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: net/minecraft/world/WorldProviderHell
at net.minecraft.world.WorldServer.<init>(WorldServer.java:49)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:72)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:105)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:429)
at net.minecraft.server.ThreadMinecraftServer.run(SourceFile:573)
Caused by: java.lang.ClassNotFoundException: net.minecraft.world.WorldProviderHell
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:211)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 5 more
Caused by: java.lang.NullPointerException
at cpw.mods.fml.relauncher.RelaunchClassLoader.findClass(RelaunchClassLoader.java:200)
... 7 more


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_15, Oracle Corporation
Java VM Version: Java HotSpot™ Client VM (mixed mode), Oracle Corporation
Memory: 389232176 bytes (371 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 2 total; -Xms512m -Xmx1024m
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v7.44 FML v5.1.10.616 Minecraft Forge 7.7.1.616 5 mods loaded, 5 mods active
mcp [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
FML [Forge Mod Loader] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Forge [Minecraft Forge] (coremods) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
mod_ReiMinimap [mod_ReiMinimap] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
mod_ThebombzenAPI [mod_ThebombzenAPI] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'forge,fml'

!!!!!

Found it at forge
Can't solve it, anyone know how to?

I think this is in the wrong section, but I'll try to help you. Make a fresh install of Minecraft ( 0 mods ), install one by one and see which causes the crash.

Ok, ill try, ive been doing this for 4 days, ever different problems

It Has To Be An Outdated Mod Or You Tried Opening It To LAN then all of it goes down reinstall all them 1 by 1 and make sure they're the latest version

Thanks EverDayGaming. FBL and MVB fault =/