Flex无法调试，怎么回事啊？

小弟是新手，用的是Flex Builder 3,Flash Debugging,插入断点，通过启动Flex Debuging模式调试的时候，出现这种情况，怎么回事啊？请各位神仙大哥帮忙！

?

Failed to connect; session timed out.

Ensure that:

??1. You compiled your Flash application with debugging on.

??2. You are running the debugger version of Flash Player.

1 楼 zouwu85 2011-04-13 flash player 不是调试版本