Importing WPMU Database

I build a WMPU/BuddyPress dev site and am now attempting to "migrate" it to a new install under the main domain name.

I exported from the dev site the database (via PhPMyAdmin) and from the WP export (XML) file function.

I installed WPMU to the new site and then logged into PhPMyAdmin to import the database I got this error:

#1050 - Table 'wp_1_comments' already exists

Should I install BuddyPress first, before doing this db import?

Any other tips on doing this "migration"?