`Facebook.Unity.Settings' has already been imported error solution

after import facebook sdk to unity, i get the '`Facebook.Unity.Settings' has already been imported' error, solution is:

1. delete projectLibraryFacebookSDK folder

2. restart unity

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原文地址：https://www.cnblogs.com/lurenjiashuo/p/Facebook-Unity-Settings-has-already-been-imported-error-solution.html