Try clearing the cache! Most probably it is corrupted. First close Dreamweaver. Then type %appdata% into the File Explorer address bar and hit Enter. Then navigate to the Adobe folder. Inside the Adobe folder, find and open the Dreamweaver folder. Then, delete the cache files.

The cache files may be in a folder labeled ‘Cache’ or ‘Temp’. You can safely delete these files as they will be recreated by the software when needed.