[xwiki-users] Executing code - Difference between Register page and others ?

Hi, I put some code in space.vm to retrieve my data: #set($mydb=$xwiki.sql.getDatabase("myDB")) #foreach($row in $mydb.executeQuery("select name from mytable")) $row.getString(0) #end When I open Home page or any page but Log in and Register page, it's all ok. I don't know there's difference between these 2 page and others? Any tell me how to fix this problem? Thank you. -- Ngô Thị Hồng Nga