knitr no longer supports \SweaveOpts{}

in your case, `\SweaveOpts{concordance=TRUE}` is not parsed by `knitr`, and it is also the wrong way to use concordance in knitr; the correct way is:

```r
opts_knit$set(concordance=TRUE)
```

actually I guess concordance is not useful to package vignettes; do you really need it?