@Override
        protected void drawGuiContainerBackgroundLayer(float par1, int par2,
                        int par3) {
                //draw your Gui here, only thing you need to change is the path
                int texture = mc.renderEngine.getTexture("/gui/trap.png");
                GL11.glColor4f(1.0F, 1.0F, 1.0F, 1.0F);
                this.mc.renderEngine.bindTexture(texture);
                int x = (width - xSize) / 2;
                int y = (height - ySize) / 2;
                this.drawTexturedModalRect(x, y, 0, 0, xSize, ySize);
        }
 
  
I replaced this with the recommended code: 
 
this.mc.renderEngine.bindTexture("/gui/trap.png");            // With this
                int x = (width - xSize) / 2;
                int y = (height - ySize) / 2;
                this.drawTexturedModalRect(x, y, 0, 0, xSize, ySize);
 
  
The "mc.renderengine" section doesn't work.