"Attempt to call a method that has not been implemented" is the error message.
I can then go on to select text, then click Apply which takes me to the Apply Redactions screen (where it warns you the information will be permanently removed / remove metadata too). Then click OK and get the same error message.
Searching for this type of error on here, there's people who have the option of redacting greyed-out; this is different as it seems to function but it stops me as somehow it's not been implemented? Am I missing something?
Edit and convert PDFs, General troubleshooting, How to