Error: object 'vars.available' not found in dagitty() on macOS 11 with R 4.4.2

[CWWhitney]

I'm encountering an error when using the dagitty package on macOS 11 with the latest R 4.4.2 binary. Every time I try to create a simple DAG, I get the following error:

Error in get("vars.available", .dagitty.cache) : object 'vars.available' not found

I am using R 4.4.2 (binary for macOS 11) on a Mac with version 15.3.1 (build 24D70).

An example (from the help files):

library(dagitty) dag <- dagitty("dag { a -> b; b -> c; d -> c }")

What I Have Tried:

• Restarting the R session and my machine
• Updating macOS
• Removing and reinstalling dagitty from CRAN
• Manually initializing the cache with:
  if (!exists("vars.available", envir = .dagitty.cache)) { assign("vars.available", character(0), envir = .dagitty.cache) }
• Installing the GitHub version via remotes::install_github("jtextor/dagitty/r")

I get the same errors after all these steps...

Any help in resolving this issue would be greatly appreciated. Thanks!