Error Help?

I'm looking for someone to shed some light on the following error, which is proving to be a nuisance indeed. It occurs upon opening the game project, and directs me to the following line of code in the class "Game":

A5.setItem(bomb);

The error is as follows:

java.lang.NullPointerException

at Game.placeItems(Game.java:36)

at Game.<init>(Game.java:30)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at bluej.runtime.ExecServer$3.run(ExecServer.java:871)

java.lang.NullPointerException

at Game.placeItems(Game.java:36)

at Game.<init>(Game.java:30)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at bluej.runtime.ExecServer$3.run(ExecServer.java:871)

java.lang.NullPointerException

at Game.placeItems(Game.java:36)

at Game.<init>(Game.java:30)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at bluej.runtime.ExecServer$3.run(ExecServer.java:871)

java.lang.NullPointerException

at Game.placeItems(Game.java:36)

at Game.<init>(Game.java:30)

at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)

at java.lang.reflect.Constructor.newInstance(Constructor.java:513)

at bluej.runtime.ExecServer$3.run(ExecServer.java:871)

[2453 byte] By [Bishiea] at [2007-11-27 4:00:19]