Stan not running after updating to r version 4.0.2 and stan updated from 2.19.3 to 2.21

[bgoodri]

You probably just temporarily need

Error in compileCode(f, code, language = language, verbose = verbose) : Compilation ERROR, function(s)/method(s) not created! Again

@andrjohns @Charles_Driver @JacobCoblentz In a clean R session without any old stanfit objects being autoloaded, try doing install.packages( "https://win-builder.r-project.org/8bPDZPDG0522/rstan_2.21.2.zip", repos = NULL, type = "win.binary") then example(stan_model, package = "rstan", run.dontrun = TRUE) plus whatever examples were not working before.