[dokuwiki] user manager help please - errors setting up plugin

let just start by saying that I am a new user, and have not been able to
find this answer on the list or elsewhere.

I have installed dokuwiki and have it running successfully, by this I mean
that I have added a couple of pages in the system.
I have installed the user manager plugin from
http://resources.neolao.com/php/dokuwiki/plugin_usermanager
just unziped into plug in directory - shows up in manage plugin

local.php looks like this

$conf['useacl'] = 1; //Use Access Control Lists to restrict access?

$conf['openregister']= 1; //Should users to be allowed to register?

$conf['autopasswd'] = 0; //autogenerate passwords and email them to user

$conf['authtype'] = 'plain'; //which authentication backend should be used

$conf['passcrypt'] = 'smd5'; //Used crypt method
(smd5,md5,sha1,ssha,crypt,mysql,my411)

$conf['defaultgroup']= 'user'; //Default groups new Users are added to

When I am doing functions in user manager like adding a user

    a. multiple entries for the user get created ~20 in the 
users.auth.phpfile - also display on web browser

    b. when browser returns from submit event I get errors at top of page

       *Warning*:
unlink(D:\WebApps\LDAP\dokuwiki\data\pages/start_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin.txt.lock):
Permission denied in *D:\WebApps\LDAP\dokuwiki\inc\common.php* on line *412*

*Warning*:
file(D:\WebApps\LDAP\dokuwiki\data\pages/start_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin_do_admin.txt.lock):
failed to open stream: No error in *D:\WebApps\LDAP\dokuwiki\inc\io.php* on
line *45*

*Warning*: join(): Bad arguments. in
*D:\WebApps\LDAP\dokuwiki\inc\io.php*on line
*45*

*Warning*: Cannot modify header information - headers already sent by
(output started at D:\WebApps\LDAP\dokuwiki\inc\common.php:412) in *
D:\WebApps\LDAP\dokuwiki\lib\plugins\usermanager\admin.php* on line *77*

*Warning*: Cannot modify header information - headers already sent by
(output started at D:\WebApps\LDAP\dokuwiki\inc\common.php:412) in *
D:\WebApps\LDAP\dokuwiki\inc\actions.php* on line *91*


Any ideas on how to fix or what I may have done wrong?

Thanks..

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