If you're getting something like the following error when you're setting up your calendar in Tern it's likely because you're trying to connect an unsupported calendar.
{ "message": "Either the connected calendars are read-only, or you are trying to connect an unsupported account such as IMAP: [https://developer.nylas.com/docs/calendar/#limited-calendar-support-for-imap-providers](https://developer.nylas.com/docs/calendar/#limited-calendar-support-for-imap-providers)", "type": "all_cals_readonly" }Tern supports the following providers. Note that generic IMAP calendar providers are not supported as IMAP is a read only protocol. That means that Tern can not create events on your calendar and thus can't function.
Key | Provider |
| Gmail and Google Apps. |
| Microsoft Exchange (ActiveSync) and Microsoft Office365. |
| Microsoft Exchange. |
| |
| Yahoo! Mail. |
If you are getting a "read only" error try changing the calendar provider you are connecting with or select a different protocol (not IMAP).