Hi tmhphotos,
Could you describe the workflow you're using when you're getting this error message?
Are the images already imported? Are you doing any folder renaming while they're importing?
Do you have admin (read/write) permissions to the folder that you're importing into?
Mac or Windows?
Which version of Lightroom 3? (have you installed all of the updates?)
Answers to these questions will help us help you better,
Get back to us when you can,
Thanks!
Pete