Here is my problem, anybody that know how to fix please help fast.

I got this on Debugging

All errors (1) queries (6) blocks (0) extra (0) timers (3)
Errors

Notice: Only variables should be assigned by reference in file /modules/system/admin/preferences/main.php line 50

Queries
SELECT * FROM xoops_config WHERE (conf_modid = '0' AND conf_catid = '1') ORDER BY conf_order ASC
SELECT sess_data FROM xoops_session WHERE sess_id = 'a09843586abd4a02b301b0a1d4ba335e'
SELECT * FROM xoops_users WHERE uid=1
SELECT * FROM xoops_modules WHERE dirname = 'system'
SELECT * FROM xoops_configcategory
SELECT * FROM xoops_group_permission WHERE (gperm_name = 'module_admin' AND gperm_modid = '1' AND (gperm_groupid = '1' OR gperm_groupid = '2'))