R CMD check found ERRORs

there is no package called 'usethis'

Process completed with exit code 1.

'::' or ':::' import not declared from: ‘usethis’

2 of 40 (5.0%) transitions ended with a divergence.

3 of 40 (8.0%) transitions ended with a divergence.

227 of 1200 (19.0%) transitions ended with a divergence.

4 of 4 chains had an E-BFMI less than 0.2.

225 of 1200 (19.0%) transitions ended with a divergence.

4 of 4 chains had an E-BFMI less than 0.2.

The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, n1hility/cancel-previous-runs@v2, r-lib/actions/setup-r@v2.2.6. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/