Unused import statement
Answered
I have imported project via build.gradlew file. But it seems to be some javaFx libraries don't works properly. I use macOS bigSur 11.0.1 and IntelliJ IDEA 2020.3.

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Double check JDK is configured correctly for the project, see https://stackoverflow.com/a/61180376/104891.
already double checked.
Could you please share the screenshot with the JDK classpath configuration tab? Does it help if you remove the JDK, install the JDK again, add a new JDK in IntelliJ IDEA and configure this new JDK for the project?
JDK classpath tab:
Did you try to reinstall the JDK?
Firstly i Mac User, secondly yes, i have already reinstalled it
OS doesn't matter for my question.
Please provide the screenshot of the Project Structure | SDKs, JDK, Classpath tab like shown above.
Does the issue persist if you switch to a different JDK, not Amazon?
Please try File | Invalidate Caches | Invalidate and Restart.
same situation as before
Does the problem occur in 2020.2.4 release from https://www.jetbrains.com/idea/download/previous.html ?
Does it manifest as the red code in the editor for JDK classes only?
Does the project build?
Which other JDK versions have the same problem?
Yes, project only runs at only JDK classes is red
Intellij 2020.3
Please try the previous release and see if it has the same issue.
Delete IDE system directory when the IDE is not running and see if it helps: https://www.jetbrains.com/help/idea/tuning-the-ide.html#system-directory .
it works now, I have installed 2020.1.4 version. Please could you give me feedback, when problem will resolved wiwth new version. Thank you in advance.
Please file a bug at https://youtrack.jetbrains.com/newIssue?project=IDEA with the logs from 2020.3 version (Help | Collect Logs and Diagnostic Data).