Im using:
MCA: 4.1.2
Radixcore: 1.3.3 univ
Fml: 10.12.1.1082
MC version 1.7.2

I let my game run until it launches and mean while, im tabbed out, until it loads to the [esc] screen but when i hit [back to game] it gives me this:
Connection lost
A fatal error has occured, this connection is terminated

I do have other mods running along side this one, and ive tried MCA alone and with other mods but i get the same message each time.

please help soon, this is one of my favorite mods, thanks, ~Sock

p.s. if this has an easy solution to it please feel free to <DOCTYPE.shootme>

Could you get this to happen again, then copy your ForgeModLoader-client-0.log file into a comment? It should be in your .minecraft folder.

Its changed now, when i spawn a villager in, it gives me: connection lost disconected from server.

also there is no such file with that name in my .minecraft folder, could it be in [Log] or [crash-reports]?

heres the crash report following my current attempt:

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

Time: 10/3/14 9:46 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:192)
at com.google.common.collect.SingletonImmutableList.(SingletonImmutableList.java:40)
at com.google.common.collect.ImmutableList.of(ImmutableList.java:89)
at cpw.mods.fml.common.network.FMLOutboundHandler$OutboundTarget$4.selectNetworks(FMLOutboundHandler.java:110)
at cpw.mods.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:273)
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:115)
at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:626)
at io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:878)
at io.netty.channel.AbstractChannel.write(AbstractChannel.java:229)
at io.netty.channel.embedded.EmbeddedChannel.writeOutbound(EmbeddedChannel.java:195)
at cpw.mods.fml.common.network.internal.FMLNetworkHandler.makeEntitySpawnAdjustment(FMLNetworkHandler.java:108)
at net.minecraft.entity.EntityTrackerEntry.func_73117_b(EntityTrackerEntry.java:387)
at net.minecraft.entity.EntityTracker.func_85172_a(EntityTracker.java:336)
at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:285)
at net.minecraft.world.World.func_72866_a(World.java:2019)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:659)
at net.minecraft.world.World.func_72870_g(World.java:1983)
at net.minecraft.world.World.func_72939_s(World.java:1836)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:500)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:620)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:531)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:669)

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

-- Head --
Stacktrace:
at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:192)
at com.google.common.collect.SingletonImmutableList.(SingletonImmutableList.java:40)
at com.google.common.collect.ImmutableList.of(ImmutableList.java:89)
at cpw.mods.fml.common.network.FMLOutboundHandler$OutboundTarget$4.selectNetworks(FMLOutboundHandler.java:110)
at cpw.mods.fml.common.network.FMLOutboundHandler.write(FMLOutboundHandler.java:273)
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)
at io.netty.handler.codec.MessageToMessageEncoder.write(MessageToMessageEncoder.java:115)
at io.netty.handler.codec.MessageToMessageCodec.write(MessageToMessageCodec.java:116)
at io.netty.channel.DefaultChannelHandlerContext.invokeWrite(DefaultChannelHandlerContext.java:644)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:698)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:637)
at io.netty.channel.DefaultChannelHandlerContext.write(DefaultChannelHandlerContext.java:626)
at io.netty.channel.DefaultChannelPipeline.write(DefaultChannelPipeline.java:878)
at io.netty.channel.AbstractChannel.write(AbstractChannel.java:229)
at io.netty.channel.embedded.EmbeddedChannel.writeOutbound(EmbeddedChannel.java:195)
at cpw.mods.fml.common.network.internal.FMLNetworkHandler.makeEntitySpawnAdjustment(FMLNetworkHandler.java:108)
at net.minecraft.entity.EntityTrackerEntry.func_73117_b(EntityTrackerEntry.java:387)
at net.minecraft.entity.EntityTracker.func_85172_a(EntityTracker.java:336)
at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:285)
at net.minecraft.world.World.func_72866_a(World.java:2019)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:659)
at net.minecraft.world.World.func_72870_g(World.java:1983)

-- Entity being ticked --
Details:
Entity Type: null (net.minecraft.entity.player.EntityPlayerMP)
Entity ID: 99305
Entity Name: Figment_of_mind
Entity's Exact location: 244.72, 16.52, -819.99
Entity's Block location: World: (244,16,-820), Chunk: (at 4,1,12 in 15,-52; contains blocks 240,0,-832 to 255,255,-817), Region: (0,-2; contains chunks 0,-64 to 31,-33, blocks 0,0,-1024 to 511,255,-513)
Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1836)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:500)

-- Affected level --
Details:
Level name: New World
All players: 1 total; [EntityPlayerMP['Figment_of_mind'/99305, l='New World', x=244.72, y=16.52, z=-819.99]]
Chunk stats: ServerChunkCache: 667 Drop: 0
Level seed: 5335837538918462851
Level generator: ID 01 - flat, ver 0. Features enabled: true
Level generator options: 2;7,10x1,3x3,2;1;stronghold,biome_1,village,decoration,dungeon,lake,mineshaft,lava_lake
Level spawn location: World: (260,4,-888), Chunk: (at 4,0,8 in 16,-56; contains blocks 256,0,-896 to 271,255,-881), Region: (0,-2; contains chunks 0,-64 to 31,-33, blocks 0,0,-1024 to 511,255,-513)
Level time: 1937 game time, 1937 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 17785 (now: false), thunder time: 164326 (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:620)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:531)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:414)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:669)

-- System Details --
Details:
Minecraft Version: 1.7.2
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: 209686424 bytes (199 MB) / 408166400 bytes (389 MB) up to 2134114304 bytes (2035 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
AABB Pool Size: 1413 (79128 bytes; 0 MB) allocated, 1248 (69888 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.03 FML v7.2.196.1082 Minecraft Forge 10.12.1.1082 5 mods loaded, 5 mods active
mcp{9.03} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
FML{7.2.196.1082} Forge Mod Loader Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Forge{10.12.1.1082} Minecraft Forge Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
radixcore{1.3.3} RadixCore Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
mca{4.1.2} [Minecraft Comes Alive](MCA-4.1.2 MC-1.7.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available->Available->Available->Available->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 241 (13496 bytes; 0 MB) allocated, 221 (12376 bytes; 0 MB) used
Player Count: 1 / 8; [EntityPlayerMP['Figment_of_mind'/99305, l='New World', x=244.72, y=16.52, z=-819.99]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

Unfortunately, I can't really support an issue on 1.7.2 anymore. The only thing I could tell you is to update to 1.7.10, use the recommended version of Forge on it, and see if that helps.