Possible mistaken null statement

Can anyone help me out with what this means/how to correct the warning? This line of code has a red squigly line under the semicolon and the tool tip says "Possible mistaken null statement". I've searched around but can't find an answer.

Code:

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if (File.Exists(Application.StartupPath + "\\message.txt"));

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Thanks,
Mike

Take out the semicolon. What a dummy - I had "search in titles only" checked. Apologies.