AS plugins插件ButterKnife、GsonFormat錯誤Marketplace plugins are not loaded.Check the internet connection

最近更新了一下Android studio3.5，想加入插件 Android ButterKnife Zelezny 和 GsonFormat 結果plugins 中顯示無法連接網絡 。  marketplace plugins are not loaded.Check the internet connection and refresh 我就上網查資料，上面說Appearance&Behavi

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