My button USED to work to send a message. Now I click the button and get this error message. I’ve tried signing out and back in, syncing, re-doing the formula in the button…nothing works. 
Help?!
yep, I have the same. Everything worked fine and all out of a sudden I got this message. It is annoying if you don’t have a clue where to look or what to do, certainly not when the same action was previously running well.
I can only hope that these errors are the price we pay for huge improvements to be shown on oct 6 
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Expectations for October 6 is sky high, I think.
besides my remaining high hopes for oct 6, the error I noticed was caused by a mistake on my side. I changed the code just a little bit, but enough to break it and in this context Coda did not provide any warning, everything seemed fine. In the Gmail::SendEmail it is so important to keep track of the commas.