help please

[firesong9898]

hi, ok im not new to web design, but new to this type script,it installed good, but one prob, the admin/index.php when i go to admin panel i get this error.

 

Fatal error: Call to undefined function tep_not_null() in /home/a1587693/public_html/admin/includes/classes/language.php on line 74

 

before there was 2 of them and a little different,

 

any ideas , i would be gratefull