OK here is the fix. Same happened to me.
Find the line that says (mine is line 102) in /includes/modules/shipping/upsoath.php
case '1.1.0':
Change it to
case '1.2.0':
That removes the error. However, It still does not show rates on the estimator nor the checkout page. I have yet to figure that one out. It may be a template issue on my side.
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