Java Error
已回答
Today I checked an older project of mine and I got the error provided in the link below.
At first, it asked me to set up the SDK, which I did, but the error persisted and now I am still unable to compile the project. All java files instead of being blue are now orange. So what should I do?
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Do you use any build system (Maven, Gradle)? Is folder containing these files marked as sources root?