Fatal error during 0.9.26 to 0.9.28 upgrade

I tried updating my site to 0.9.28 using the bin/gpm self-upgrade option, but it threw this error:

Fatal error: Class 'Symfony\Component\Console\Input\ArrayInput' not found in /home/sigmaof/public_html/system/src/Grav/Console/ConsoleTrait.php on line 99

The site appears to be working fine but I was wondering if this is a know or serious issue.

Cheers
Craig

Nothing to worry about!

http://getgrav.org/forum#!/general:gpm-grav-update-0928-no
http://getgrav.org/forum#!/general:upgrade-issue

Thanks for Grav! :D