Roxio 2011 Pro

I use the above software to create an AVCHD disc of a holiday. The program performs o.k. until the burn disc session. The Burn disk goes through all the processes i.e. Open Project: Encode Movies: Encode Menus, but after moving onto Writing Format after about 10 seconds it reports an error! “Project_BuildToDevice()AuthorScript call failed. Error whilst Writing Format.” I’ve deleted and reinstalled the Software and created a new movie from scratch. However when burning a disc the same error appears. If I change the project type to a DVD format, it burns a disc perfectly. I have burned other holiday movies in AVCHD format previously with no errors. Can anyone help or offer any solutions?