"unknown category" - error and white screen of death error

 If moodle gives you an error called 'unknown category' and / or goes blank, this is the fix:

cd /var/www/html/moodle

pico config.php

look for the line that mentions a theme:

$CFG->theme='boost';

put a hash mark in front of it, like so:

# $CFG->theme='boost';

this line in the config file basically forces moodle to use the default theme.

discussion is here: 

https://moodle.org/mod/forum/discuss.php?d=393412

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