Installed fire core and no apps work

Installed fire core and no apps work, not even ones that came with fire core(xmbc, nitro, etc) Every time I launch one it says plug in failed. What’s up?

Ugh… Same here… XBMC launches and navigates but all video add-ons fail…! Supper frustrated as I found completely free methodes to get both my Mac & PC laptops up and running with Kodi and it was smooth sailing…! Feeling taken advantage of as easy installation and setup is a major part of the sales pitch for this product…!

Any and all suggestions or advise would be helpful.

Thanks