ORA-01460 error when useing bind sql on oracle from php

I get "ORA-01460: unimplemented or unreasonable conversion requested" when useing bind-sql on Oracle 9i. I am useing OCI 8.1 client in PHP. What is wrong? And what does this message mean? Here is the code: ---***--- $bindarray1=array(':project1'=>$project); $bindarray1[':userid']=$userid; $rs = sql_query($qs,$bindarray1); function sql_query($qs,$bindargs) { $stmt = @OCIParse($this->db_sqlhandler, $qs); if (!$stmt) {

    return false;

} //bind all the variables if (is_array($bindargs)){

    foreach ($bindargs as $bindname => $bindvalue){
      OCIBindByName($stmt,$bindname,&$bindvalue,-1);
    }

} if (@OCIExecute($stmt)) {

    return $stmt;

} $DB_ERROR = OCIError($stmt); return $DB_ERROR; } ---***--- vardump of bindargs: array(2) { [":project1"]=> int(1) [":userid"]=> string(5) "10001" } vardump of DB_ERROR: array(4) { ["code"]=> int(1460) ["message"]=> string(62) "ORA-01460: unimplemented or unreasonable conversion requested " ["offset"]=> int(0) ["sqltext"]=> string(365) "SELECT acl.prjid, acl.groupid, acl.read_access , acl.write_access,acl.delete_access,acl.change_access FROM StructureTreeTbl outree, GroupChildrenTbl gg2, MembersTbl memb2, ACL acl WHERE (memb2.personid=:userid AND memb2.groupid=gg2.gchildid AND gg2.groupid=outree.orgchild AND outree.orgid = acl.groupid AND acl.prjid=:project1) " }