Unknown attribute layout_width

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4

I am working on android project, all was working well, until suddenly I opened Android Studio and found warnings all my layout files. E.g unknown attribute android:layout_width, unknown attribute android:id etc. I tried creating a new layout resource file and it also did the same, only options available now are constraint_width,height and so on. What could be my problem here?

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6

Just on menu bar invalide caches and restart Android-Studio: File -> Invalide Caches/Restart

That should help

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