解决Eclipse报错显示Unable to build: the file dx.jar was not loaded from the SDK folder

由于最近通过SDK-Manager更新了build-tools，当要用到dx.jar这个包时，自动调用最新build-tools中dx.jar，但是运行android项目时Console却提示：   Failed to load C:\Program Files (x86)\Android\android-sdk\build-tools\26.0.0-preview\lib\dx.jar Unab

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