Coding in Eclypse, Minecraft Client CRASH

**Hello,**


I downloaded Eclipse and Minecraft coderspack, and i made my own client...
But i copied mcp (coders pack) so i dont lose everything when Eclipse crashes...
Then i got a problem and i restored my copied mcp in Eclipse; everything loads...
But when i want to run my 'client', it gives me a black screen forever until i close it...
I coded much, so hopefully someone could help me...
The codes are still in the file. 
Console tells me:



    java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:55)
    at net.minecraft.src.AchievementMap.<init>(AchievementMap.java:20)
    at net.minecraft.src.AchievementMap.<clinit>(AchievementMap.java:11)
    at net.minecraft.src.StatBase.registerStat(StatBase.java:61)
    at net.minecraft.src.StatBasic.registerStat(StatBasic.java:20)
    at net.minecraft.src.StatList.<clinit>(StatList.java:22)
    at net.minecraft.src.Item.<clinit>(Item.java:659)
    at net.minecraft.src.Block.<clinit>(Block.java:1271)
    at net.minecraft.src.TextureWaterFX.<init>(TextureWaterFX.java:20)
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:248)
    at net.minecraft.src.MinecraftAppletImpl.<init>(MinecraftAppletImpl.java:16)
    at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
    at net.minecraft.client.Minecraft.main(Minecraft.java:2276)
    at Start.main(Start.java:22)
    Exception in thread "main" java.lang.ExceptionInInitializerError
    at net.minecraft.src.StatCollector.<clinit>(StatCollector.java:5)
    at net.minecraft.src.Block.translateBlockName(Block.java:1142)
    at net.minecraft.src.StatList.initMinableStats(StatList.java:182)
    at net.minecraft.src.StatList.<clinit>(StatList.java:87)
    at net.minecraft.src.Item.<clinit>(Item.java:659)
    at net.minecraft.src.Block.<clinit>(Block.java:1271)
    at net.minecraft.src.TextureWaterFX.<init>(TextureWaterFX.java:20)
    at net.minecraft.client.Minecraft.<init>(Minecraft.java:248)
    at net.minecraft.src.MinecraftAppletImpl.<init>(MinecraftAppletImpl.java:16)
    at net.minecraft.client.MinecraftApplet.init(MinecraftApplet.java:25)
    at net.minecraft.client.Minecraft.main(Minecraft.java:2276)
    at Start.main(Start.java:22)
    Caused by: java.lang.NullPointerException
    at java.io.Reader.<init>(Reader.java:61)
    at java.io.InputStreamReader.<init>(InputStreamReader.java:80)
    at net.minecraft.src.StringTranslate.loadLanguageList(StringTranslate.java:45)
    at net.minecraft.src.StringTranslate.<init>(StringTranslate.java:27)
    at net.minecraft.src.StringTranslate.<clinit>(StringTranslate.java:14)
    ... 12 more