Beat'em Up Game

[Bruto_JPO]

Hi I'm from Brazil and I'm developing a Beat'em Up game for my conclusion work in universisty. I'm using a game api in this site http://code.google.com/p/sporksoft/s...sporksoft/game

This game api is exactly the same as the jme.

I'm having a problem, each time I use a game api method I have an null error and my app stop.

 //Method that adjusts Axel's sprite
        public void adjustAxel( Sprite s, double mx, double my ){
      	  try{
      		  mPositionX = (int) mX;
          	  mPositionY = (int) mY;
 
          	  mManager.append( mAxelSprite );
          	  mAxelSprite.defineReferencePixel( mAxelWidth / 2, 0 );
          	  mAxelSprite.setRefPixelPosition ( mPositionX, mPositionY);
          	  mAxelSprite.setFrameSequence( mFrameSequence );
      		}catch( Exception e ){
		         	   Log.e( CATEGORIA, "Error 2: " + e.getMessage() );
		           }
        }

I don't have an idea how to fix it, and in my country are very few people that develop in android platform so here I'm to search for help.

Greetings
John Peter