I get an XML parse error when trying to deploy my data model in Flash Builder 4 Beta 2 with the Modeler Plugin installed. It says it cannot recognize model, which is the base tag. I know there has been some issues with this in Eclipse also, but it's particularly troubling because I use this process to figure out which pieces of the FML are causing Fiber to not start on my server.
Can you please check for the logs? Please share the logs with us.