Here are the screenshots from different IDEs.
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Karan Mehta
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Ketan Kadam
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have you installed Dart & Flutter plugin on AS? – Diwyansh Nov 29 '21 at 14:08
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This is a problem of corrupt cache. Go to File from menu and click on invalidate cache/restart and your problem will be fixed – Shatanik Mahanty Nov 29 '21 at 15:18
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@Diwyansh yes, I have dart and flutter plugins installed on my android studio and as well as on VScode. – Ketan Kadam Nov 30 '21 at 04:13
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@ShatanikMahanty I have tried it several times also, I have reinstalled Android studio twice but this problem still exists..:( – Ketan Kadam Nov 30 '21 at 04:15
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Solved by reinstalling flutter SDK and moving all of my project files to a new location. – Ketan Kadam Nov 30 '21 at 07:13