'There was an error creating a user'

Hi,

I'm trying to batch add a group of users from an Excel spreadsheet. The sheet looks like this:

london london testuser1 null qa.user01@kaplan.com
london london testuser2 null qa.user02@kaplan.com
london london testuser3 null qa.user03@kaplan.com
london london testuser4 null qa.user04@kaplan.com

If the sheet has only one line it works perfectly.

However, when there are multiple lines the import processes one line, then fails with this error:

2011-10-20 12:00:50 - User: testuser4 created!
2011-10-20 12:00:50 - User testuser4 successfully added to blog schoolsportal.tlamp1aplon.aspectworld.com/london/
2011-10-20 12:00:51 - There was an error creating a user

If I go back and tell it to continue processing the the queue it successfully adds the second user, but fails again:

2011-10-20 12:00:50 - User: testuser4 created!
2011-10-20 12:00:50 - User testuser4 successfully added to blog schoolsportal.tlamp1aplon.aspectworld.com/london/
2011-10-20 12:00:51 - There was an error creating a user
2011-10-20 13:00:54 - User: testuser3 created!
2011-10-20 13:00:54 - User testuser3 successfully added to blog schoolsportal.tlamp1aplon.aspectworld.com/london/
2011-10-20 13:00:54 - There was an error creating a user

So effectively I have to go and press the process queue button for each line on the file (obviously defeating the object of the plugin)

If there any way to get better debug info?

It's strange because the users are getting added, I have tested this by logging in.

Thanks in advance