Rstan in Rstudio aborts after applying the pairs() function in a Mac with M1 Pro

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Hi, Andrew,

Thank you for the answer. When I install StanHeaders and rstan, I get the warning:

Warning in install.packages :
  unable to access index for repository https://mc-stan.org/r-packages/bin/macosx/big-sur-arm64/contrib/4.1:
  cannot open URL 'https://mc-stan.org/r-packages/bin/macosx/big-sur-arm64/contrib/4.1/PACKAGES'

  There is a binary version available but the source version is later:
              binary source needs_compilation
StanHeaders 2.21.0-7 2.26.4              TRUE

I installed both anyway, but the model cannot be fitted. I can generate the data (using algorithm=fixed_par) but that is all. When I try to fit the model now I get:

Error in stanc(file = file, model_code = model_code, model_name = model_name,  : 
  parser failed badly

Also, if I exit RStudio and open it again, when I try to generate the data again (and the compiled file for the data generation already existed), I get

Error in if (!file.exists(file.rds) || (mtime.rds <- file.info(file.rds)$mtime) <  : 
  missing value where TRUE/FALSE needed

What should I do? I found a post (Sampler won't start if adapt_delta is used: why?) where someone recommends installing development versions. Is that advisable?

Thank you again.

Alejandro.