An exception has been thrown during the rendering of a template

[ajgbasic]

An exception has been thrown during the rendering of a template ("The Process class relies on proc_open, which is not available on your PHP installation.")

On a clean Grav installation, trying to access "Scheduler" tab on Tools

[rhukster]

As the exception says, you don't have access to proc_open PHP function. This is typically a security thing on your hosting provider's side. You can try asking them to enable this command, but without it, the Grav schedular is not able to function.

If they won't help you, I suggest looking for a better hosting option? Digital Ocean can be easily setup to work 100% with Grav.