@Thembelani Mlalazi - when mentioning a DC member in a post it looks like you're copying and pasting the member name in a way that carries over a hyperlink. That hyperlink markup seems to prevent the DC software from recognizing the user. I recommend using the Preview button as a way of checking that the "mention" syntax is correct.

In any case it may be overkill to mention someone who has already contributed to the thread, since they typically get notified of updates unless they have deliberately unsubscribed.

From http://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=...

To ensure Caché the needed access to all instance database, journal and log files that are outside the Caché installation tree, grant the Cache_Instance_instancename group full access to these files and the directories containing them.

(my highlighting)

Also, remember that in DC you can comment on an answer (like I am doing here) rather than posting your response as though it's another answer.