Airtable won't let me create any buttons - persistent error message

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5 - Automation Enthusiast
5 - Automation Enthusiast

Hi all.  Airtable is refusing to allow me to create any buttons anywhere in tables (i.e. data section of Airtable), only in interfaces.

When I try to create a button field in a table, I always get the same error message: "

Sorry, there was a problem creating this field. The options are not valid."
It doesn't matter which browser, which device, mobile app - Airtable will not allow me to create any button fields. 
You can see a short video of the error in action:
Any insight gratefully appreciated, as I really want to start making some buttons to trigger various actions like sending emails or text messages.
4 Replies 4

You have to type a valid formula. If you want a URL, it has to be in quotes. 

Yes, sorry, just made this quickly. Yes, I've tried with quotes for the URL but I still get the same message. 

You also need to fill in the label.

5 - Automation Enthusiast
5 - Automation Enthusiast

Wow - that was it! I've just made a button. Thank you!