Exporting to jar error

[Sean2012]

Hi, i'm trying to export my eclipse project to a jar. I export it and everything is fine but when i go to run it i get this error.

C:\Documents and Settings\Administrator\Desktop>java -jar game.jar
Running...
Check Texures!
Exception in thread "Thread-3" java.lang.ExceptionInInitializerError
        at com.war.warfare.graphics.Render3D.floor(Render3D.java:58)
        at com.war.warfare.graphics.Screen.render(Screen.java:27)
        at com.war.warfare.Display.render(Display.java:137)
        at com.war.warfare.Display.run(Display.java:107)
        at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: java.lang.IllegalArgumentException: input
 == null!
        at com.war.warfare.graphics.Texture.loadBitmap(Texture.java:19)
        at com.war.warfare.graphics.Texture.<clinit>(Texture.java:8)
        ... 5 more
Caused by: java.lang.IllegalArgumentException: input == null!
        at javax.imageio.ImageIO.read(Unknown Source)
        at com.war.warfare.graphics.Texture.loadBitmap(Texture.java:11)
        ... 6 more

I'm new to java and can't find out what is wrong. I also uploaded my project files game.zip
Thanks for any help!