I have resolved my issue.
I did a search of the current users on the web server (obviously bitnami, daemon, and are in this list.
I then searched the groups that these users belong to and found that the user belongs to a group called bitnami_admins.
I added to the bitnami_admins group and also to the daemon group
i am not sure about being a member of the daemon group, perhaps i should remove myself from it?
Anyway, this sorted my problem...Wordpress now is able to access the required directory reqested by the WP Encrypt plugin during its registration process.