myeclipse调试flex是，可以调试，但是看不到值怎么回事

myeclipse调试flex是，可以调试，但是看不到值怎么回事，那位可以帮忙解决，谢谢？

报的错是：

An internal error occurred during: "Evaluating Flex expression...".

java.lang.NullPointerException

java.lang.NullPointerException

at flash.tools.debugger.concrete.PlayerSession.pullUpActivationObjectVariables(PlayerSession.java:1007)

at flash.tools.debugger.concrete.PlayerSession.requestFrame(PlayerSession.java:984)

at flash.tools.debugger.concrete.DStackContext.populate(DStackContext.java:156)

at flash.tools.debugger.concrete.DStackContext.getThis(DStackContext.java:92)

at com.adobe.flexbuilder.debug.djapi.wrappers.ThreadSafeFrame.getThis(ThreadSafeFrame.java:121)

at com.adobe.flexbuilder.debug.model.FlexStackFrame.initVariables(FlexStackFrame.java:283)

at com.adobe.flexbuilder.debug.model.FlexStackFrame.getVariables(FlexStackFrame.java:410)

at com.adobe.flexbuilder.debug.expression.FlexStackContext.lookup(FlexStackContext.java:52)

at flash.tools.debugger.expression.VariableExp.evaluate(VariableExp.java:28)

at com.adobe.flexbuilder.debug.djapi.wrappers.ThreadSafeValueExp.evaluate(ThreadSafeValueExp.java:54)

at com.adobe.flexbuilder.debug.expression.FlexExpression.evaluate(FlexExpression.java:120)

at com.adobe.flexbuilder.debug.expression.FlexWatchExpressionDelegate$EvaluationJob.run(FlexWatchExpressionDelegate.java:103)

at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)

 

workspace下的.metadata配置文件有问题，可以重新建个workspace，重新配置建个项目，可以啦。