Quix 1.9.1 added new cache system and it seems caused the issue with php 5.6. Which php version are you using ?
If possible please switch php version to 7.0 and recheck.
NOTE: You can reinstall Quix 1.9.0 instead using 1.9.1
Joomla! name is used under a limited license from Open Source Matters in the United States and other countries.
WarpTheme.com is not affiliated with or endorsed by Open Source Matters or the Joomla! project