--- re-building ‘introduction.Rmd’ using rmarkdown

processing vignette 'introduction.Rmd' failed with diagnostics:

Vignette re-building failed.

Build process failed

Process completed with exit code 1.

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions/cache@v2. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/cache@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Fortran 2018 deleted feature: DO termination statement which is not END DO or CONTINUE with label 20 at (1)

Fortran 2018 deleted feature: DO termination statement which is not END DO or CONTINUE with label 35 at (1)