The path field must contain only alphanumeric characters in ojs 3.1.2-1

[ctgraham]

These errors indicate that your cache directory is not writable by the webserver process. This is probably causing the display issue.

How should file permissions be set?

There isn’t a straightforward answer because so much depends on your hosting environment. Start with your hosting provider’s documentation and support, or with your system administrator, and with the following instructions: How to set your permissions In general, you want your permissions set such that your webserver can read and write (recursively) to config.inc.php's files_dir, and to ./cache/, and ./public/. Optionally, for added features and reduced security, you can enable write to confi…