Android------Eclipse run error prompt Failed to load D:\Android\sdk\build-tools\26.0.0-preview\lib\dx.jar

After updating the SDK, there was a problem running the project on Ecplise.

This error is indicated on the run: Your project contains error (s), please fix them before running Your application. (Your program contains errors, modify and then run).

The console is output like this:

Hint Dx.jar file did not load to, according to some methods on the net try also not, I found D:\Android\sdk\build-tools\ this directory, directory, such as,

I think, since he can't find 26.0.0 this folder, then I'll delete it.

I cut the 26.0.0 folder to a different location to back it up to avoid errors. Opening eclipse again runs successfully.

After deleting the directory map:

Android------Eclipse run error prompt Failed to load D:\Android\sdk\build-tools\26.0.0-preview\lib\dx.jar