Re: Errors after trying to move files
If you really do have data on your dev server that you need to move to your production server, and assuming that you do not have any hardcoded URLs, then there are a few ways that this may be accomplished. I’ve never tried this with a WPMU installation, but this first article worked fine with a single-user WP domain migration.
http://www.mydigitallife.info/2007/10/01/how-to-move-wordpress-blog-to-new-domain-or-location/
The next two articles are from the WP codex. I am not sure if they are fully applicable to WPMU, I’m providing them just for reference. As always, back up your data, back up your data, backup your data.