Why do I get an error page when I try to submit my application?

<span style="font-size: 11pt;"><span style=""><span style="font-family: Calibri,sans-serif;">If you see the below message when you are submitting your application, one or more of your uploads (either in the school questions or the Common App, usually the Citizenship question, sections) may be the cause.  <br><br>Preview each upload to make sure it appears properly.  If you find one that does not appear as you intended, or is missing, remove it and upload it again, making sure the file name does not contain special characters.<br><br>This should resolve the issue.  If not, please reach out to our Solutions Center team at appsupport@commonapp.net and we will help.</span></span></span><br><br><br><span style="font-size: 11pt;"><img alt="User-added image" src="https://commonapp--c.na126.content.force.com/servlet/rtaImage?eid=ka10V…;