Error, unable to load libraries

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

When I try to check libraries – “Site Administration -> Plugins -> H5P Libraries”. I get empty page and message – “Sorry, that didn’t work. Please try again or came back later. 500 Error. Internal Server Error”

I was re-installed plugin twice. No effects. Problems is the same.

No other errors on the screen. No errors in browser console, no PHP errors in logs.

On local moodle site (site for testing, moodle v3.0.3) the plugin work good, no problem.

That libraries I  missing ?

Thanks in advance