升级adt插件后，eclipse突然出现Unable to build: the file dx.jar was not loaded from the SDK folder 错误

升级adt插件后，eclipse突然出现Unable to build: the file dx.jar was not loaded from the SDK folder 错误 Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!  升级adt插件后，eclipse突然出现上面错误

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