What’s the version of withr you have installed? Seems related to Why shows Error: 'makevars_user' is not an exported object from 'namespace:withr' - #5 by Paule_ka . I would expect install.packages("withr") to resolve the issue. (at one point we had to recommend users to downgrade their withr - New error: cleanup_makevar(old) : argument "RMU" is missing, with no default - #30 by stevebronder - but that should be no longer needed).
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