What does errno=13 mean when connecting via OpenVPN? [closed]

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The tail-end of an OpenVPN connection (that otherwise appears successful) says (with leading timestamps omitted):

Note: Cannot open TUN/TAP dev /dev/net/tun: Permission denied (errno=13)

Note: Attempting fallback to kernel 2.2 TUN/TAP interface

Cannot allocate TUN/TAP dev dynamically

Exiting

What is the problem here?

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Preface you OpenVPN command (line) with sudo...

i.e. the command requires root access to operate successfully