升級adt插件後，eclipse突然出現Unable to build: the file dx.jar was not loaded from the SDK folder 錯誤
前幾天在ecplise上運行項目還好好，今天一運行就提示這個錯誤：Your project contains error(s), please fix them before running your application.（你的程序包含錯誤，請修改後再運行）。咋一看，以爲代碼哪裏寫錯了，我是左改右改，上改下改......還是提示這個錯誤，心都碎了：
控制檯是這樣輸出的：
[2017-03-28 22:11:52 - Dex Loader] Failed to load D:\Android\sdk\build-tools\26.0.0\lib\dx.jar
[2017-03-28 22:11:52 - api19] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!
[2017-03-28 22:12:11 - Dex Loader] Failed to load D:\Android\sdk\build-tools\26.0.0\lib\dx.jar
[2017-03-28 22:12:11 - api19] Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!
提示dx.jar文件沒加載到，按網上一些方法試了也不行，我就找到D:\Android\sdk\build-tools\這個目錄，目錄如下圖，我想，既然他找不到26.0.0這個文件夾，那我就把它刪了。我把26.0.0文件夾剪切放到別的位置備份，以免出錯再恢復回來。再次打開eclipse運行就成功了，哈哈，我太聰明瞭
刪了後的目錄圖：
