Thank you for the prompt reply @andresrcs. I did that and then got this error.
Error: package or namespace load failed for ‘lme4’ in get(method, envir = envir):
lazy-load database '/Library/Frameworks/R.framework/Versions/3.6/Resources/library/statmod/R/statmod.rdb' is corrupt
In addition: Warning message:
In get(method, envir = envir) : internal error -3 in R_decompress1
However, after restarting R the error disappeared and the packages loaded correctly. While solved, would it be possible to share some insight about how this occurred out of the blue? Thank you 