无法在Codeigniter中修改标头信息错误-Google App Engine

Question

I'm getting the following error in codeigniter once I deploy it in server. I do not get this error in localhost. I'm not sure where I'm going wrong. Any suggestions. I'm using Google Apps Engine.

Fatal error: Call to a member function result_array() on a non-object 
in /base/data/home/apps/s~some-app/1.401263586523638658/application/models/Some_model.php on line 199
A PHP Error was encountered

Severity: Warning

Message: Cannot modify header information - headers already sent by (output started at /base/data/home/apps/s~some-app/1.401263586523638658/application/models/Some_model.php:199)

Filename: core/Common.php

Line Number: 569

Backtrace:

A PHP Error was encountered

Severity: Error

Message: Call to a member function result_array() on a non-object

Filename: models/Some_model.php

Line Number: 199

Backtrace:

I checked the controller and models for any white space and I do not have any such. This particular function is also not used by any cron job as mentioned in another post.

Edited to add code:

$query = "select u.id, u.queue_name, u.queue_email, u.tickets_for_all  
                    from agent_queue_mapping_table as m, queue_table as u 
                    where u.id=m.queue_id 
                    and u.company_id = ".$this->session->userdata('user_comp_id')." 
                    and m.user_id = ".$this->session->userdata('user_id');
    $queue_details = $this->db->query($query);                       
    return $queue_details->result_array();

Answer 1

1.Check the PHP version of your server.

2.Get your SQL query by using $this->db->last_query() and run the query on MySQL console and check if there any errors.

3.Check the result_array() array function usage in your controller. send us your screenshot of the code here to check on that section

Answer 2

I got this error, because I had not updated a table that I had to alter. Once I did that, this issue got resolved.