Hey, I am trying to build a MIDlet, and I am not good, I keep getting this error, and I am not sure what it actually means, any help would be amazing.

I am using the Sun Java Wireless Toolkit 2.5.2


Project settings saved
Building "Tester"
Error preverifying class javax.swing.SwingBeanInfoBase
java/lang/NoClassDefFoundError: java/beans/SimpleBeanInfo
Build failed


Thanks in advance to anyone who helps!