oracle db faulty statements

if i want to select the itemlist in the web-frontend, i get the following error:
• ociexecute() [<a href='function.ociexecute'>function.ociexecute</a>]: ORA-00932: inconsistent datatypes: expected - got NCLOB [include/db.inc.php:458]
• SQL error [ORA-00932: inconsistent datatypes: expected - got NCLOB] in [SELECT DISTINCT i.*,hg.groupid FROM items i,hosts_groups hg WHERE ((i.itemid BETWEEN 000000000000000 AND 099999999999999)) AND (i.hostid IN ('10017')) AND (hg.groupid IN ('4')) AND hg.hostid=i.hostid AND ( (i.flags IN ('0','4')) )]
• ocifetchinto() [<a href='function.ocifetchinto'>function.ocifetchinto</a>]: ORA-24374: define not done before fetch or execute and fetch [include/db.inc.php:606]

attached the screenshot