eclise 出现错误，无法运行是怎么回事啊
[2017-03-26 16:02:59 - Dex Loader] Failed to load /Users/apple/Documents/adt-bundle-mac-x86_64-20140702/sdk/build-tools/26.0.0-preview/lib/dx.jar
[2017-03-26 16:02:59 - hello] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!
跑程序后就出现以上两个错误，请问如何解决啊，创建avd出现an android virtual device that failed to load。简直无语了，
