Error in install.packages

I'm trying to use the leaflet package but when i try to install, i get this error message,
"Warning in install.packages :
package ‘leaflet’ is in use and will not be installed"

Does anyone have a solution to the problem?

Try installing on a fresh R session, you can restart your session with Ctrl+Shift+F10 and then try again

install.packages("leaflet")

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