Thanks wbond for taking the time to explain that. 
Is there any temporary solution that I could use, to at least remove some of the errors in the list, or perhaps increase the width of the popup box to remove some of its height?
Since the popup box is larger than my laptop screen height I cannot hit the OK button to dismiss the message. The OK button is out of sight! 
The only way for me to “ignore” the message is to force-close sublime through the Activity Monitor.
------- UPDATE -------
So apparently new users cannot post more than three times in a topic, so I am editing here @kingkeith and @wbond because I cannot reply to you below. Apologies that this may be a confusing way to continue our conversation.
Pressing esc does not clear the error message on Mac.
Rather there is just a disruptive error sound.
Is there any other method (other than force-closing Sublime) to solve this issue? Some way to shorten the amount of errors being displayed?