Impossible to update my galeries

Hi everyone and thanks you for your time.

This is my situation, we are a french company and for our corporate website we use Mudslideshow to show our flickR picture in our website galery.
It was simple, until now i just had to upload news pics in Flickr and update my galerie to also have the new pics on my website.
I had some new pics to had today, and when update Mudslideshow on my website an error message appear “erreur lors de la mise à jour” translated by “error during the update”.

I’m totally lost about the solution, and i’ve to say that Mudslideshow was a very practical pluggin and i would like to keep using it.

Thanks for your help !

my website : https://www.alliance-fermeture.net

https://www.ads-software.com/plugins/mudslideshow/