It is not necessarily a problem, unless you were expected to send a payment to the IRS or your State agency. If you were expecting a return it will not be an issue.
You can still file for for prior years up to 2014 Tax year and receive a return (if you qualify)
If you are in your online account and see those years rejected, read the explanation, fix the reason for the rejection, print and mail. All with the exclusion of 2013.
