Creating a new window

On one of the projects I am working on, I need to create a new window.
I keep getting an error message when I go to create a new window.
It is this:

org.xml.sax.SAXParseException: XML document structures must start and end within the same entity.

Can you explain what this error is? I haven’t had this problem before. I don’t know if I changed something accidentally or what the problem is.

This error indicates that something has gone quite wrong in the Gateway. To troubleshoot something like this, you’d want to look at the gateway logs. They are in C:\Program Files\Inductive Automation\FactoryPMI\logs

You’ll see a bunch of files there ending with a timestamp, like FPMIService.log.html.2008-02-08, and one file that is named FPMIService.log.html. This is todays log file. You can open this file up in Internet Explorer, or email it to to have us take a look at it.