When I tried loading the BiodiversityR package on my Windows machine, I got a popup (actually, it popped up underneath the RStudio window) requesting some packages to be installed:
Any chance that's what you're seeing? I'd also suggest using the preview release rather than the v1.2 daily builds for now, as v1.2 is under active development and somewhat less stable than our release channel.
If not, then the only other thing I might suggest is making sure all of your R packages are up-to-date, in case the issue relates to an older R package dependency.