It has completed but you have a large number of usernames with problems(spaces, invalid chars, etc.) and default Joomla behavior is to return an error string on the URL. If you look at that url you will see some of the errors. I will try to improve this in future versions but you should work from that error message for the time being. You will notice the characters are URL encoded, use this tool to decode them:
http://meyerweb.com/eric/tools/dencoder/Here is the response you are getting, fix those and then run again:
Failed :AW : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576fi : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576B : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576Ye-Fei : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
5765c : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576T-Banger : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576km : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576Pc : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576Ty : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576K : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576jo : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576jc : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576j : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576ez : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576belle-belle : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576zt : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576M : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576me : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576Kz : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576lz : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576KC : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576my : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576-k- : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576KT : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576mc : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576SOO-DA : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576Biblio-bi-bi : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576T-RoX : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576pj : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576uni-bum : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576RR : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576yb : Failed : Please enter a valid Username:. No spaces, more than 2 characters and contain 0-9,a-z,A-Z
/home/befuzzco/public_html/unswcomsoc/administrator/components/com_smf/admin.smf.class.php
createjoomlauser
576DC : Failed : Please enter a valid