menu problem

[deepak_evil]

i have created a j2me game menu in canvas system but the problem is i am not ble to switch to nother screen when the user selects the command usin display.setCurrent(ab) it throws a null pointer exception instead and the application dies
each canvas has its own thread

[deepak_evil]

I every one i am still unable to set my next displayable screen my game screen what should i do please rectify the code and post it