missing left parenthesis

can anyone find the error in this select?

select * from dbo_contacts c
WHERE  (first_name IS null 
                 OR trim(first_name) = '')
                AND (last_name IS null 
                 OR trim(last_name) = '')
                AND (title IS null 
                 OR trim(title) = '')
                AND (contact_description IS null 
                 OR trim(cast(contact_description AS VARCHAR)) = '')
                AND NOT EXISTS
                   (SELECT p.contact_id
                    FROM   dbo_phone p
                    WHERE  (p.llc = 1
                            OR p.wps = 1)
                           AND p.contact_id = c.contact_id
                           AND p.mig_del IS null)
                AND mig_del IS null;

Code (markup):

it claims i'm missing a left parenthesis in between the "contact_description" and "IS" of line 8

i can't figure it out

 

You cannot cast to VARCHAR.

Thanks

Lavee