[2017-12-07 19:25:24 - Hellow] Unable to resolve target 'android-14'

[2017-12-07 19:25:24 - Hellow] Unable to resolve target 'android-14'

[2017-12-07 19:37:31 - Dex Loader] Failed to load F:\android-sdk-windows\build-tools\27.0.2\lib\dx.jar

[2017-12-07 19:37:31 - hellow] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!

显示这些错误信息，，，这啥情况，，，跪求大神解决谢谢l