Not able to acces the Help function on the packages

Hello,
I have installed several packages in R studio. They are well activated (with the hook in the box on the side). When I want to access the Help option (by clicking on the activated packages or by writing it in Rscript), I always get an error message: The access path specified cannot be found.

Have any of you had this problem or know how to fix it?

Thank you very much, and have a great day!

Beatrice