Library File not included correctly

Problem/Motivation

Moved library file to libraries folder and then got white screen

Proposed resolution

Add a library include in hook_init() in the module file:

/**
 * Implements hook_init().
 */
function campaignmonitor_init() {
  if ($path = libraries_get_path('campaignmonitor')) {
    require_once '';
    $path . '/campaignmonitor.class.inc';
  }
}