This error message means that the slider added to the page does not exists and could not be loaded.
To help solve this, check to make sure that the "alias" attribute in the Slider's shortcode has no special characters or spaces.
If you Purchased & Registered a Slider Revolution License you can comfortably upgrade version 5.x to 6.0 from your WordPress Dashboard.
Activating Slider Revolution with your Personal Purchase Code will unlock all available Features.
*Regular License from $29. One License Key required per Domain.