[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!

跑程序后就出現以上兩個錯誤，請問如何解決啊，創建avd出現an android virtual device that failed to load。簡直無語了，