Import / Export (MSC Files) does not work properly

So many thanks in advance for that incredible plugin. I have two WordPress pages with different databases but with similar conten. I have exported (in MSC files) a group of shortcodes that I have made to import them in the another site, the problem is that does not import nothing, all that I can see at the top after “import” the MSC file is the page link that is:

https://www.mypage.com/wp-admin/admin.php?page=my-shortcodes&cat=error:packwasempty.Perhapstheexportdidnthaveanyelementsselected?

But no any shortcode has been imported really… What does mean? Pack was empty perhaps the export didnt have any elements selected? How can I check if the export was successful? :S

C.

https://www.ads-software.com/extend/plugins/my-shortcodes/