The xml file which defines the Workspace layout has become corrupt.
Navigate to the file via the path listed in your post, delete it and relaunch Dreamweaver.
If Dreamweaver still won't launch. delete the entire Configuration folder. Dreamweaver should then create a fresh Configuration folder the next time you launch it.
Locating your personal configuration folder
Many thanks, all sorted. Problem was locating the files but the link showed how to discover the hidden files. Many thanks for a prompt solution. YIPEEEEEE