Error when i try to add a new activity

Hi,
I have install the plugin but when i try to add a new activity to my course the editor’s message appears is "Error, unable to load libraries."
Moodle v3.0
H5P v1.8
Hosting – hostgator.com

This message "Error, unable to load libraries." appear during the execution of a module  "h5peditor-editor.js"

code execution:

// Load libraries data
    $.ajax({
      url: this.contentWindow.H5PEditor.getAjaxUrl(H5PIntegration.hubIsEnabled ? 'content-type-cache' : 'libraries')
    }).fail(function () {
      $container.html('Error, unable to load libraries.');
    }).done(function (data) {
      if (data.success === false) {
        $container.html(data.message + ' (' + data.errorCode  + ')');
        return;
      }

What does this error mean ?

Thanks