怎么调试这个异常，异常信息如下

如何调试这个错误，错误信息如下
[code=Java][/code][2012-06-15 14:16:32 - Mp3Player01] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.
[2012-06-15 14:16:33 - Mp3Player01] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.
[2012-06-15 14:17:24 - SDK Manager] Warning: Ignoring platform 'android-1.1': build.prop is missing.
[2012-06-15 14:18:13 - Mp3Player01] Android requires compiler compliance level 5.0 or 6.0. Found '1.7' instead. Please use Android Tools > Fix Project Properties.


------解决方案--------------------
eclipse->项目右击->android tool->Fix Project Properties