Error loading sf package - "package or namespace load failed"

[erikpeterson20]

I'm trying to use spdep package to create an auto-covariate. When I try to load spdep I receive the following error message regarding the sf package is needed by spdep:

library(spdep)
Loading required package: sf
Error: package or namespace load failed for ‘sf’ in namespaceExport(ns, exports):
undefined exports: as_difftime, as_units, deparse_unit, drop_units, install_unit, keep_units, load_units_xml, make_unit_label, make_units, mixed_units, remove_unit, scale_x_units, scale_y_units, set_units, ud_are_convertible, unitless, units_options, valid_udunits, valid_udunits_prefixes
Error: package ‘sf’ could not be loaded
In addition: Warning message:
S3 methods ‘[.mixed_units’, ‘[.units’, ‘[<-.units’, ‘[[.units’, ‘[[<-.units’, ‘units<-.logical’, ‘units<-.mixed_units’, ‘units<-.numeric’, ‘units<-.units’, ‘Math.units’, ‘Ops.mixed_units’, ‘Ops.symbolic_units’, ‘Ops.units’, ‘Summary.units’, ‘all.equal.units’, ‘anyDuplicated.units’, ‘as.Date.units’, ‘as.POSIXct.units’, ‘as.character.mixed_symbolic_units’, ‘as.character.symbolic_units’, ‘as.data.frame.units’, ‘as.list.units’, ‘as_units.Date’, ‘as_units.POSIXt’, ‘as_units.call’, ‘as_units.character’, ‘as_units.default’, ‘as_units.difftime’, ‘as_units.expression’, ‘as_units.mixed_units’, ‘as_units.name’, ‘as_units.symbolic_units’, ‘as_units.units’, ‘boxplot.units’, ‘c.mixed_units’, ‘c.units’, ‘diff.units’, ‘drop_units.data.frame’, ‘drop_units.mixed_units’, ‘drop_units.units’, ‘duplicated.units’, ‘format.mixed_units’, ‘format.units’, ‘hist.units’, ‘log10.units’, ‘log2.units’, ‘mean.units’, ‘median.units’, ‘mixed_units.numeric’, ‘mixed_units.units’, ‘plot.units’, ‘print.mixed_units’, ‘print. [... truncated]

**I've consulted help forums for tips, no luck. I've updated packages, tried to install the sf package in a variety of ways according to online forums that say they're supposed to resolve the above error problem, but no luck. I always get the same darn message. Does anyone out there with more R/computer programming competency than myself know what the issue is that's preventing me from being able to load spdep?

Thank you**

[rsbivand]

Help forums don't help. Read the relevant parts of R FAQ, possibly also for your platform (macOS or Windows): https://cran.r-project.org/faqs.html.

Do run update.packages(), from the command line not RStudio. Do not install source packages on Windows or macOS. This feels like an out-of-date units package, but could be any other kind of package library corruption. So, update R if not using 4.1.2, update all packages, remove extraneous packages and library directories (is this macOS with two different architectures?). By the way, autocovariates are not a good idea anyway.