What's "tabs are not allowed in f# code unless the #indent off option is used" Error?

what’s “tabs are not allowed in f# code unless the #indent off option is used” Error?
I use the last version .netcore and vs 2019. I want to use the lightweight syntax

With lightweight (default) syntax, you must use spaces, not tab characters, for indentation. Most editors will allow you to automatically convert tabs to spaces as you edit.

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