The following error usually occurs sometimes when you move your website with kunena or you change templates.
0 load error: failed to find /home/xxxxxx/public_html/components/com_kunena/template/crypsis/assets/less/crypsis.less
Solutions
- Empty Joomla Cache (which should include Kunena)
or - https://www.kunena.org/forum/k-3-0-fatal-errors/128655-500-error-after-moving-website