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When I load Minecraft using Forge it will let me play for a few minutes then crash and even when I restart the game the same thing happens and I keep getting the following message:

---- Minecraft Crash Report ----
// You should try our sister game, Minceraft!

Time: 5/9/15 12:07 AM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
at net.minecraft.entity.EntityTracker.func_72788_a(EntityTracker.java:270)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:715)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:598)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:164)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:478)
at java.lang.Thread.run(Thread.java:745)


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

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 180239120 bytes (171 MB) / 546004992 bytes (520 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.10 FML v8.0.76.1402 Minecraft Forge 11.14.1.1402 6 mods loaded, 6 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{8.0.76.1402} [Forge Mod Loader] (forge-1.8-11.14.1.1402.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{11.14.1.1402} [Minecraft Forge] (forge-1.8-11.14.1.1402.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
securitycraft{v1.7.4.1} [SecurityCraft] ([1.8] SecurityCraft v1.7.4.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
cfm{3.4.7} [§9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7-build5(1.8).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
XaeroMinimap{1.4.5} [Xaero's Minimap] (xaeros_minimap_v1.4.5_1.8_Forge.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Loaded coremods (and transformers):
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [EntityPlayerMP['UnknownElement28'/233, l='New World', x=-149.50, y=63.69, z=274.10]]
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge

Current Launcher Version: 1,6,11

Current MC Version: 1.8

Mods Installed: [1.8] SecurityCraft v1.7.4.1, MrCrayfishFurnitureModv3.4.7-build5(1.8), and xaeros_minimap_v1.4.5_1.8_Forge

Try allocating a tad more ram, this may fix your issue.

How do I do that exactly?

I'm assuming you're using the official launcher?

Yes that is correct I'm using the official launcher.

Click edit profile there should be a box that says "JVM arguments" put the following -Xmx4096M -Xms4096M this is assuming you have more than 4 gigabytes, you want to keep a buffer.

Okay and I have only 3GB of ram installed on my computer.