wp_enqueue_scripts in a plugin’s class

First of all – I’m not sure why you are registering jquery-ui-core. WordPress has already registered jQuery UI scripts (see here). You should use the shipped jquery and jquery-ui scripts rather than registering your own.

As for the error – the second argument add_action (and apply_filter for that matter) is a callback. To have a class method as a callback, you need to specify the class. In your case, using $this:

add_action('wp_enqueue_scripts', array($this,'slider_load_js'));

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