C:\Windows\System32\Macromed\Flash\Flash10a.ocx Flex Builder cannot locate the required debugger version of Flash Player. You might need to install the debugger version of Flash Player 9 or reinstall Flex Builder. Do you want to try to debug with the current version?
这是因为:flex builder 3 默认安装的是flash player debugger 9.而最新的是 player 10 debugger版。如果安装的是10a,也会偶尔提示这个错误。