ooooooo
you deleted the user that you are attempting to run the script with correct?
2 things you can do.... either go into the ?externalid? table in the gallery DB and remove the users VBB ID number(admin is 1, you would be 2, that kinda stuff), or create a ANOTHER NEW user and then run the script with him again.
basically gallery does not ?ever? delete the external ID's of users. so you have to manualy manipulate the table to get them working agin. i am, about 70% sure that this is the problem... not 100% sadly