I was working on my mod, and it has a variable that should only be initiated on the server side. So before the constructor of my main mod I put a "public RadioHelper serverRadioHelper;" then in my preinit:

	if(side==Side.SERVER){
		serverRadioHandler = new RadioHandler();
	}

and I access this variable in a tileenitity, and it throws a null pointer. I access it in updateEntity, here's the method:

@Override
public void updateEntity(){
	if(hasStarted==false&&side==Side.SERVER){
		hasStarted=true;
		//add to radio handler server side
		System.out.println("test");
		CloudSound.instance.serverRadioHandler.addRadio(new RadioHelper(xCoord, yCoord, zCoord, worldObj.provider.dimensionId));
	}
}

I'm clueless at the error right now. =/ Anyone have an idea?

Show me the stack trace.

Drop a breakpoint after the if statment and check what happens.

What's null should take you 2 secs to determine once you do that