android-support-v7-appcompat Error

[2014-12-03 11:49:13 - android-support-v7-appcompat] E:my projectandroidandroid-support-v7-appcompatresvalues-v21styles_base.xml:75: error: Error retrieving parent for item: No resource found that matches the given name 'android:Widget.Material.ActionButton'. [2014-12-03 11:49:13 - android-support-v7-appcompat] E:my projectandroidandroid-support-v7-appcompatresvalues-v21themes_base.xml:191: error: Error: No resource found that matches the given name: attr 'android:colorPrimaryDark'. [2014-12-03 11:49:13 - android-support-v7-appcompat] 解决办法: 将文件project.properties中的 target=android-19 改为 target=android-21 后clean 即可解决