This is a problem with the OLE Server. As users have mentioned on the official forums, to solve this application, simply start Corel without any file and while it's starting continuously press F8 until you see Rebuilding Workspace. After this procedure, open the file again and the error should disappear completely.
If you still have issues, go to where Corel is installed and look for a .BAK file that matches the name of your file. Close the original file and open the BAK one and then use File > Save. This procedure uses the backup file to regenerate the original one.