Array to string conversion error?

[eluser]Unknown[/eluser]
Hi all,

I have successfully used CI pagination library from 1.7 and now I am trying to use the 2.0 version but my "old" method seems to no longer work and I get

A PHP Error was encountered

Severity: 4096

Message: Object of class CI_DB_mysql_result could not be converted to string

Filename: controllers/Phones.php

Line Number: 66

and

A PHP Error was encountered

Severity: Notice

Message: Object of class CI_DB_mysql_result to string conversion

Filename: controllers/Phones.php

Line Number: 66

Here is my Model(well at least the function being called)

Code:

function getAllPhoneDetails($limit = 5, $offset = 0){
   $query ="SELECT manufacturer.name as manufacturer,phone.model, " .
     "phone.phoneID, phone.IMEI, status.name as status ".
     "FROM phone, status, manufacturer " .
     "WHERE phone.status = status.statusID AND " .
     "manufacturer.manufacturerID = phone.manufacturerID ".
     "LIMIT ".$limit." OFFSET ".$offset."";
  
   $result = $this->db->query($query);
   if ($result->num_rows() > 0){
    return $result;
   }else{
    return null;
   }
  
}

my controller:

Code:

function paginate($data){

    
  if($this->uri->segment(3) == null){
   $data['phoneDetails'] = $this->phone_Model->getAllPhoneDetails($config['per_page'], 0 );
  }else{
   $data['phoneDetails'] = $this->phone_Model->getAllPhoneDetails($config['per_page'], $this->uri->segment(3) );//this is line 66
  }
  
  $config['total_rows'] = 200;//$this->phone_Model->getAllPhoneDetails()->num_rows();//get ALL rows
  
  $this->pagination->initialize($config);
  return $data;  
}

Any ideas on what I am doing wrong?