问题
Kotlin: Language version 1.1 is no longer supported; please, use version 1.2 or greater.
方案一
1.打开Settings,在搜索栏搜索 Kotlin Compiler
2.设置 language version、API version 为1.2，点击确定即可
方案二
如果还不行，可以将更新渠道解决，1.3以上即可
Kotlin: Language version 1.1 is no longer supported; please, use version 1.2 or greater.
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