the slideshows you’ve created with the Allslider function you can use only at the top of a page / post, as header slideshow. Please take a look at the settings box below the editor when you edit the page, theres is a tab called “Slideshows”, please open it, choose a slider type ( i.e. Cycle ) and as slideshow source the “Carrousel_Principal”.
The slideshow shortcode is only for slideshows in the content area, and you have to insert the images between the shortcode tags:
[slideshow type="" ....] <img src="http://..." /> <img src="http://..." /> [/slideshow]