I am not able to reproduce this javascript error. have you tried deleting the Dreamweaver Cache file from the users configuration folder?
common_installation_issues.pdf
if that does not resolve the issue, please provide some more details:
What is your OS?
What Version Of Dreamweaver?
In Site Sculptor, what Site Type, Design and Theme did you select?
Did you select the Include Content management option?
Did you make any changes to the Site Type, design or theme?