Immigration Law Questions? Ask an Immigration Lawyer.
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In a word, yes, this may be an issue.
While your status is not expired, your greencard document is. You can renew the greencard document. You are still a Lawful Permanent Resident even if your greencard document is expired. The problem is that to file for citizenship, you need an un-expired, current greencard document. So one renews the greencard, and then files for citizenship.
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The best option here is to reschedule the appointment if possible. You will have to call and try, or visit and talk with an agent via Infopass. Renewal of greencard takes about 6 months. If the appointment can be rescheduled that far ahead, it may work.
If not, then someone in your situation would have to cancel the N-400, then get the greencard renewed, and then re-file the N-400 anew.
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