Why wrong: Advice, like information, is a non-count or mass noun. Mass nouns are used for masses like sand that are too big to count their individual parts. That means that they can’t be plural or take an indefinite article (a or an means one, which is a number). In French, mass nouns are signified by du, de la or de l’. For more information, click here.
Correct it: With mass nouns, don’t use indefinite articles (an advice) or try to make them plural (advices). If you mean only one thing, say “Let me give you a piece of advice.” If you mean many things, it should be “Let me give you some advice.”.
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