我正在使用Eclipse pulsar for mobile developer和MOTODEV SDK以及iDEN sdk用于j2me（midp2.0）。
Eclipse中的Debuggin midlet出现错误：找不到类。
任何人都可以帮我确定此错误的来源吗？
!ENTRY org.eclipse.mtj.core 4 120 2010-08-05 04:26:53.009
!MESSAGE Couldn't connect to virtual machine
!STACK 0
java.io.IOException: Debugger launch time-out exceeded
at org.eclipse.mtj.internal.core.launching.midp.EmulatorRunner.waitForRemoteDebugger(Unknown Source)
at org.eclipse.mtj.internal.core.launching.midp.EmulatorRunner.createVirtualMachine(Unknown Source)
at org.eclipse.mtj.internal.core.launching.midp.EmulatorRunner.runInDebug(Unknown Source)
at org.eclipse.mtj.internal.core.launching.midp.EmulatorRunner.run(Unknown Source)
at org.eclipse.mtj.internal.core.launching.midp.EmulatorLaunchConfigDelegate.launch(Unknown Source)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:853)
at org.eclipse.debug.internal.core.LaunchConfiguration.launch(LaunchConfiguration.java:703)
at org.eclipse.debug.internal.ui.DebugUIPlugin.buildAndLaunch(DebugUIPlugin.java:866)
at org.eclipse.debug.internal.ui.DebugUIPlugin$8.run(DebugUIPlugin.java:1069)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)