[TYPO3-shop] WEC Staff Directory - install problem

[Jogvan Olsen]

Hi List
I am trying to install the 'WEC Staff Directory', and every ting work fine 
in backend, but in frontend I get this error message:
------------------------------
0 Unknown column 'B.last_name' in 'order clause'
1 SELECT * FROM tx_wecstaffdirectory_info AS A, fe_users AS B WHERE 
A.feuser_id = B.uid AND A.pid in (165) AND A.deleted=0 AND A.hidden=0 AND 
A.hidden=0 ORDER BY B.last_name ASC,B.name

Warning: mysql_fetch_assoc(): supplied argument is not a valid MySQL result 
resource in /var/lib/typo3/typo3_src-4.0.4/t3lib/class.t3lib_db.php on line 
802

Warning: Cannot modify header information - headers already sent by (output 
started at /var/lib/typo3/typo3_src-4.0.4/t3lib/class.t3lib_div.php:2787) in 
/var/lib/typo3/typo3_src-4.0.4/typo3/sysext/cms/tslib/class.tslib_fe.php on 
line 2853
------------------

I use:
TYPO3 ver. 4.0.4
Templa Viola ver 1.1.0
WEC Staff Directory ver. 0.9.4


Does anyone have any idea of what I am doing wrong?


Thanks in advance
Jogvan Olsen