Cannot install

[Babado66]

When installing dlookr it seems to download but does not appear in the "packages" session of Rstudio. When I try to run diagnose() I get an error message that it can't find the "function"

[choonghyunryu]

@Babado66,

It is difficult to judge because there is not enough information.
Please share the results of the following three runs.

sessionInfo()
searchpaths()
dlookr::diagnose