That's just a deprecation warning. Not really a big deal. To fix, you could try the following.
Edit file qa-plugin/blog-post/blog-admin.php and replace this function:
function qa_html_theme_layer($template, $content, $rooturl, $request) {
global $qa_layers;
$this->plugin_directory = $qa_layers['Blog Settings']['directory'];
$this->plugin_url = $qa_layers['Blog Settings']['urltoroot'];
qa_html_theme_base::qa_html_theme_base($template, $content, $rooturl, $request);
}
With this function:
function __construct($template, $content, $rooturl, $request) {
global $qa_layers;
$this->plugin_directory = $qa_layers['Blog Settings']['directory'];
$this->plugin_url = $qa_layers['Blog Settings']['urltoroot'];
parent::__construct($template, $content, $rooturl, $request);
}
Let me know if that works.