How bad is this mistake on the Common App?

Applying to College Common and Coalition Application
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<p>So, an entire MONTH (!) after I submitted my Common App, I found out that I messed up pretty badly. My personal essay is submitted TWICE, both as a Personal Essay and Additional Information. I have no idea how I missed this the first time. I read through it so many times, I just don't know how this could have happened.....</p>

<p>I have already been deferred by the University of Chicago, probably because of this mistake. I still haven't heard from Vanderbilt because I applied there on Regular Decision. I already sent an email to Vanderbilt Admissions and explained the error. </p>

<p>But I'm wondering... How badly did I screw up? Do you guys think this was what got me deferred at UChicago?</p>

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<p>I don’t think it is a big deal at all, who ever read your ap easily saw that it was dup of your essay so not I don’t think that is why Univ of Chicago deferred you.</p>