Problem uploading images. PHP Warning: session_start(): Cannot send session cac...

Hi

I can't upload any images via type="textarea" within blog

Here's the PHP log error message:

 16-Dec-2014 16:33:18 Europe/London] PHP Warning:  session_start(): Cannot send session cache limiter - headers   already sent (output started at /Users/stephen/Repositories/project_name/perch/addons/feathers/custom- feather/runtime.php:2) in /Users/stephen/Repositories/project_name/perch/core/lib/PerchSession.class.php on line 9

What can I do to fix this?

The error message mentions my feather runtime.php file, not sure what it means? Here's my runtime.php file.

  <?php

   PerchSystem::register_feather('custom-feather');

   class PerchFeather_custom-feather extends PerchFeather
    {
public function get_css($opts, $index, $count)
{   
    $out = array();

    if (!$this->component_registered('styles')) {
        $out[] = $this->_single_tag('link', array(
                'rel'=>'stylesheet',
                'href'=>$this->path.'/css/styles.css',
                'type'=>'text/css'
            ));
        $this->register_component('styles');
    }

    if (!$this->component_registered('font-awesome')) {
        $out[] = $this->_single_tag('link', array(
                'rel'=>'stylesheet',
                'href'=>$this->path.'/css/font-awesome/font-awesome.min.css',
                'type'=>'text/css'
            ));
        $this->register_component('font-awesome');
    }


    return implode("\n\t", $out)."\n";
}

public function get_javascript($opts, $index, $count)
{
    $out = array();

    if (!$this->component_registered('flaunt')) {
        $out[] = $this->_script_tag(array(
            'src'=>$this->path.'/js/flaunt.js'
        ));
        $this->register_component('flaunt');
    }

    if (!$this->component_registered('jquery.fitvids')) {
        $out[] = $this->_script_tag(array(
            'src'=>$this->path.'/js/jquery.fitvids.js'
        ));
        $this->register_component('jquery.fitvids');
    }

    if (!$this->component_registered('fonts')) {
        $out[] = $this->_script_tag(array(
            'src'=>$this->path.'/js/fonts.js'
        ));
        $this->register_component('fonts');
    }

    return implode("\n\t", $out)."\n";
}

 }

  ?>