DLL 'htmltools' not found


I am student and I have to develop R shiny apps during my internship.

I have realized an appli which worked well,
and now the same app doesn't work anymore and I have this message for each packages install (here for leaflet) :

Erreur : package or namespace load failed for ‘leaflet’ in library.dynam(lib, package, package.lib):
The 'htmltools' DLL cannot be found: maybe it is not installed for this architecture?

I have reinstall R and each library with dependencies=TRUE, but nothing works...

Is there somebody who can help me ? One day that I am trying to figure out ...

Yhanks a lot :slight_smile: