So it shows your directory name is paypal-woocommerce-dev..?? Did you clone that out of GitHub or did you install that from the WordPress directory and then rename it, or what?
I've never once seen that error from anybody yet, and it's actually referring to a line of code that is currently commented out in our released plugin.
Seems like you've got some sort of custom thing going on here..?? Did you uncomment that line for some reason?