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I am a noob at this kind of stuff so I will post all that it says in the crash report so if you know how to fix it try to put it in the easiest way possible.

---- Minecraft Crash Report ----
// But it works on my machine.

Time: 8/8/15 4:13 AM
Description: Watching Server

java.lang.Error
at sun.misc.FDBigInteger.cmp(Unknown Source)
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.dtoa(Unknown Source)
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.access$100(Unknown Source)
at sun.misc.FloatingDecimal.getBinaryToASCIIConverter(Unknown Source)
at sun.misc.FormattedFloatingDecimal.valueOf(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.printFloat(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.lang.String.format(Unknown Source)
at net.minecraftforge.fml.relauncher.FMLRelaunchLog.log(FMLRelaunchLog.java:69)
at net.minecraftforge.fml.common.FMLLog.log(FMLLog.java:30)
at net.minecraftforge.fml.common.FMLLog.fine(FMLLog.java:72)
at net.minecraftforge.fml.common.ProgressManager$ProgressBar.step(ProgressManager.java:101)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:189)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:781)
at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:319)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:286)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
at java.lang.Thread.run(Unknown Source)

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

-- Head --
Stacktrace:
at sun.misc.FDBigInteger.cmp(Unknown Source)
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.dtoa(Unknown Source)
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.access$100(Unknown Source)
at sun.misc.FloatingDecimal.getBinaryToASCIIConverter(Unknown Source)
at sun.misc.FormattedFloatingDecimal.valueOf(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.printFloat(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.util.Formatter.format(Unknown Source)
at java.lang.String.format(Unknown Source)
at net.minecraftforge.fml.relauncher.FMLRelaunchLog.log(FMLRelaunchLog.java:69)
at net.minecraftforge.fml.common.FMLLog.log(FMLLog.java:30)
at net.minecraftforge.fml.common.FMLLog.fine(FMLLog.java:72)
at net.minecraftforge.fml.common.ProgressManager$ProgressBar.step(ProgressManager.java:101)
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:189)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.common.eventbus.EventSubscriber.handleEvent(EventSubscriber.java:74)
at com.google.common.eventbus.SynchronizedEventSubscriber.handleEvent(SynchronizedEventSubscriber.java:47)
at com.google.common.eventbus.EventBus.dispatch(EventBus.java:322)
at com.google.common.eventbus.EventBus.dispatchQueuedEvents(EventBus.java:304)
at com.google.common.eventbus.EventBus.post(EventBus.java:275)
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:119)
at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:781)
at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:319)
at net.minecraft.server.dedicated.DedicatedServer.func_71197_b(DedicatedServer.java:286)

-- Thread Dump --
Details:
Threads: "Server Watchdog" Id=39 RUNNABLE
at sun.management.ThreadImpl.dumpThreads0(Native Method)
at sun.management.ThreadImpl.dumpAllThreads(Unknown Source)
at net.minecraft.server.dedicated.ServerHangWatchdog.run(SourceFile:43)
at java.lang.Thread.run(Unknown Source)

"Netty Server IO #0" Id=30 RUNNABLE (in native)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll0(Native Method)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.poll(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl$SubSelector.access$400(Unknown Source)
at sun.nio.ch.WindowsSelectorImpl.doSelect(Unknown Source)
at sun.nio.ch.SelectorImpl.lockAndDoSelect(Unknown Source)
- locked [email protected]
- locked [email protected]
- locked [email protected]
at sun.nio.ch.SelectorImpl.select(Unknown Source)
at io.netty.channel.nio.NioEventLoop.select(NioEventLoop.java:596)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:306)
...

"DestroyJavaVM" Id=24 RUNNABLE

"Server thread" Id=22 RUNNABLE
at sun.misc.FDBigInteger.cmp(Unknown Source)
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.dtoa(Unknown Source)
at sun.misc.FloatingDecimal$BinaryToASCIIBuffer.access$100(Unknown Source)
at sun.misc.FloatingDecimal.getBinaryToASCIIConverter(Unknown Source)
at sun.misc.FormattedFloatingDecimal.valueOf(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
at java.util.Formatter$FormatSpecifier.print(Unknown Source)
...

"D3D Screen Updater" Id=21 TIMED_WAITING on [email protected]
at java.lang.Object.wait(Native Method)
- waiting on [email protected]
at sun.java2d.d3d.D3DScreenUpdateManager.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"TimerQueue" Id=19 TIMED_WAITING on java.u[email protected]8e3ac2
at sun.misc.Unsafe.park(Native Method)
- waiting on java.u[email protected]8e3ac2
at java.util.concurrent.locks.LockSupport.parkNanos(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(Unknown Source)
at java.util.concurrent.DelayQueue.take(Unknown Source)
at javax.swing.TimerQueue.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Number of locked synchronizers = 1
- [email protected]

"Thread-5" Id=18 WAITING on java.u[email protected]5dbb7c
at sun.misc.Unsafe.park(Native Method)
- waiting on java.u[email protected]5dbb7c
at java.util.concurrent.locks.LockSupport.park(Unknown Source)
at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source)
at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
at com.mojang.util.QueueLogAppender.getNextLogEvent(QueueLogAppender.java:77)
at net.minecraft.server.gui.MinecraftServerGui$4.run(MinecraftServerGui.java:157)
at java.lang.Thread.run(Unknown Source)

"AWT-EventQueue-0" Id=17 RUNNABLE
at java.lang.Thread.holdsLock(Native Method)
at java.awt.Component.checkTreeLock(Unknown Source)
at java.awt.Container.hasHeavyweightDescendants(Unknown Source)
at java.awt.Container.mixOnReshaping(Unknown Source)
- locked [email protected]
at java.awt.Component.reshape(Unknown Source)
- locked [email protected]
at javax.swing.JComponent.reshape(Unknown Source)
at java.awt.Component.setBounds(Unknown Source)
at java.awt.Component.resize(Unknown Source)
- locked [email protected]
...

"AWT-Windows" Id=15 RUNNABLE
at sun.awt.windows.WToolkit.eventLoop(Native Method)
at sun.awt.windows.WToolkit.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"AWT-Shutdown" Id=14 WAITING on [email protected]
at java.lang.Object.wait(Native Method)
- waiting on [email protected]
at java.lang.Object.wait(Unknown Source)
at sun.awt.AWTAutoShutdown.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"Java2D Disposer" Id=13 WAITING on [email protected]
at java.lang.Object.wait(Native Method)
- waiting on [email protected]
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at sun.java2d.Disposer.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

"Server Infinisleeper" Id=12 TIMED_WAITING
at java.lang.Thread.sleep(Native Method)
at net.minecraft.server.dedicated.DedicatedServer$1.run(DedicatedServer.java:73)

"Snooper Timer" Id=11 WAITING on [email protected]
at java.lang.Object.wait(Native Method)
- waiting on [email protected]
at java.lang.Object.wait(Unknown Source)
at java.util.TimerThread.mainLoop(Unknown Source)
at java.util.TimerThread.run(Unknown Source)

"Attach Listener" Id=5 RUNNABLE

"Signal Dispatcher" Id=4 RUNNABLE

"Finalizer" Id=3 WAITING on [email protected]
at java.lang.Object.wait(Native Method)
- waiting on [email protected]
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.ReferenceQueue.remove(Unknown Source)
at java.lang.ref.Finalizer$FinalizerThread.run(Unknown Source)

"Reference Handler" Id=2 WAITING on [email protected]
at java.lang.Object.wait(Native Method)
- waiting on [email protected]
at java.lang.Object.wait(Unknown Source)
at java.lang.ref.Reference$ReferenceHandler.run(Unknown Source)

Stacktrace:
at net.minecraft.server.dedicated.ServerHangWatchdog.run(SourceFile:59)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 8.1 (x86) version 6.3
Java Version: 1.8.0_45, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
Memory: 121401600 bytes (115 MB) / 259522560 bytes (247 MB) up to 259522560 bytes (247 MB)
JVM Flags: 0 total;
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1502 3 mods loaded, 3 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1502-universal.jar)
UCHIJAAA Forge{11.14.3.1502} [Minecraft Forge] (forge-1.8-11.14.3.1502-universal.jar)
Loaded coremods (and transformers):
Profiler Position: N/A (disabled)
Player Count: 0 / 20; []
Is Modded: Definitely; Server brand changed to 'fml,forge'
Type: Dedicated Server (map_server.txt)

One more thing it did say this as well.

A single server tick took 189.25 seconds (should be 0.05 max)

I hope I can get his fixed because I was making a server for me and my friend to play on with our own custom mods

This is Mojang's fault, for making 1.8 laggy and introducing a nice "feature" that kills the server if it lags too much, which is what "watching server" and "server tick took x seconds" are caused by.

To fix this, or at least prevent the server from killing itself you want to edit server.properties and set the value for "max-tick-time" to -1, which will disable the watchdog.

See this bug report for more details: MC-63590 Watchdog shuts down server