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

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 Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!  升級adt插件後，eclipse突然出現上面錯誤

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