android eclipse导入工程显示Unable to resolve target 'android-19'错误,求解!

Project has no project.properties file! Edit the project properties to set one.
[2016-07-13 13:48:05 -] Unable to resolve target 'android-19'
[2016-07-13 13:48:05 -] Unable to resolve target 'android-19'
[2016-07-13 13:48:05 -] Unable to resolve target 'android-19'

我已经改了sdk还不好使,怎么办?

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