I recently came across this error message on one of my virtual private servers, where I was trying to have a closer look at the traffic. vnstat is a really cool tool for that sort of thing and on most Linux servers you should be able to install it with sudo apt-get install vnstat.
I was running vnstat -l and got the following response:
getting traffic...Error: Unable to get interface "eth0" statistics.
Error: Interface "eth0" not available, exiting.
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