application didnt start just says application error when starting...

hi guys i have an application made wiht netbeans, in netbeans it works well with the virtual cell phone, but when i install the application on a sonyericsson w810i it just says that there is an error :S, i just add some screens before making a little more complex the application worked well in the cell phone, is there a way to know what is happening in netbeans i just make a trace but in the cell phone how can i know wich is the problem?

[448 byte] By [eckoa] at [2007-11-27 3:29:51]