AS plugins插件ButterKnife、GsonFormat错误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 结果plugins 中显示无法连接网络 。  marketplace plugins are not loaded.Check the internet connection and refresh 我就上网查资料，上面说Appearance&Behavi

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