AddCSS working on localhost but not on live site

[Joyplaz]

Hi everyone, 

I've added this code to the header hook on a custom module I'm working on.  It works perfectly on my local host, but on the live site, it's as though it blocks all css from functioning.

$this->context->controller->addCSS($this->_path . 'views/css/
    ecoIcon.css', 'all');

I've also tried...

$this->context->controller->addCSS( _PS_BASE_URL_.__PS_BASE_URI__.'modules/fyp_ecoIcon/views/css/ecoIcon.css', 'all');

... and it's the same story.  It works fine on xampp, but not on the live site.

 

Any thoughts would be greatly appreciated.

[Joyplaz]

Also, getting rid of the "all" param doesn't change the problem.