Installation and server related problems

Hi Guys,

So we had a source WP blog with H5p plugin installed. Works fine.

We then cloned the blog (https://premium.wpmudev.org/project/cloner/) and now when we save any H5P content it comes up with the message "unabletocopy" and does not display the content.

The content appears in the list of H5P content and it can be edited and the object is saved, but still does not appear in the preview, or with the shortcode - same ""unabletocopy"  appears when saving.

Hello,
Latest version of Wordpress.
Manual or automatic installation have the same result :

"Fatal error: Declaration of H5PWordPress::fetchExternalData() must be compatible with that of H5PFrameworkInterface::fetchExternalData() in /home/studiog/www/design/wp-content/plugins/h5p/public/class-h5p-wordpress.php on line 3"

It works on local wordpress, on my computer with MAMP.
Not the same website, but technically the same, just css, some plugins and content are different.

Is download of an H5P items (for example: and interactive video that I create) is a self-contain piece, which I can then upload to a website - and all H5P features will work on that piece?  In other words: is download creates a stand-alone item that can 'play' on my PC without the need to be lined to H5P website?

For example: