Rstan errors in R: Error in inDL & LoadLibrary failure

Question

I'm trying to run some rstan in RStudio from a class I'm taking, and the very first computer lab example won't work. My machine is a Windows 10, 64 bit on a Dell XPS 13 9360. I can run BRugs fine on RStudio, and that's mostly what I've been using, but I want to transition to using Stan instead.

```{r setup, include=FALSE}
knitr::opts_chunk$set(echo = TRUE,
                      tidy = TRUE)
```
```{r}
library(rstan)
library(bayesplot)
```

And I get this output:

Show in New Window package �rstan� was built under R version 4.0.5Loading required package: StanHeaders Loading required package: ggplot2 rstan (Version 2.21.2, GitRev: 2e1f913d3ca3) For execution on a local, multicore CPU with excess RAM we recommend calling options(mc.cores = parallel::detectCores()). To avoid recompilation of unchanged Stan programs, we recommend calling rstan_options(auto_write = TRUE) Do not specify '-march=native' in 'LOCAL_CPPFLAGS' or a Makevars file package �bayesplot� was built under R version 4.0.5This is bayesplot version 1.8.0

• Online documentation and vignettes at mc-stan.org/bayesplot
• bayesplot theme set to bayesplot::theme_default() * Does not affect other ggplot2 plots * See ?bayesplot_theme_set for details on theme setting

But the problem is with this code

```{stan, output.var="binomial", label=ex1, cache=TRUE}
generated quantities{
  real y;
  real p;
  
  y = binomial_rng(8, 0.5);
  p = y <= 2;
}
```

Error in inDL(x, as.logical(local), as.logical(now), ...) : unable to load shared object 'C:/Users/Teresa/AppData/Local/Temp/RtmpYde0OD/file23bc2f7df9e.dll':
LoadLibrary failure: A dynamic link library (DLL) initialization routine failed. In addition: Warning message: In system(paste(CXX, ARGS), ignore.stdout = TRUE, ignore.stderr = TRUE) : '-E' not found Error in sink(type = "output") : invalid connection Error in sink(type = "output") : invalid connection

I've searched for the error outputs but I can't find anything that helps. I tried install.packages("rstan",INSTALL_opts="--no-multiarch") and install.packages("bayesplot",INSTALL_opts="--no-multiarch") as suggested in Error in inDL(x, as.logical(local), as.logical(now), ...) : unable to load shared object but that didn't help (though maybe I should have uninstalled them first?). I'm very new to R and Stan, and I don't know what these errors are.