Error: Problem with `mutate()` column `pfts`. 

While running the "run-test-list.R," the following error can be encountered:

```
Error: Problem with `mutate()` column `pfts`.
ℹ `pfts = strsplit(pfts, "|", fixed = TRUE)`.
x non-character argument
```
The lead cause of this issue is because of the strsplit function, as it only takes character strings as input.