Cherry thank you for your suggestion but these users can not use Office 365 the way that you suggest. The computers do not belong to our company and the IT that they belong to requires that we install nothing, including Access. They are only allowed to use the database through SharePoint Online.
1. The database was published from an Access 2010 database to SharePoint online by using Publish to Access Services and it was working without this error for a long time.
2. Nancy Xie's post suggested re-uploading. That is why I was asking her how to do it because I do not see that option. I know how to Sync.
Thanks.