Rstanarm: CRAN vs Development version installation issues

[andrjohns]

Are you using R4.0 and rtools4? These kinds of errors can occur when upgrading your R and RTools version to the latest versions.

Can you try the instructions in the post below and see if they fix the problem?

R 4.0, rstan, and you

R 4.0 has released, and you are wanting to use rstan. Your models no longer run, you are getting cryptic error messages, and want to post here about it. With R4.0, and the latest compiler configuration, you must configure rstan differently. Configurations from previous versions are breaking under R 4.0. Try these things first, as they generally solve any problems I have seen others report, and problems I have observed under OSX Mojave, Catalina, and Windows 10. Summary R 4.0 does not require …