Lately seeing this issue with react 15.3.0 ... any idea how to fix this in the starter kit?
You are manually calling a React.PropTypes validation function for thepathprop onRoute. This is deprecated and will not work in the next major version. You may be seeing this warning due to a third-party PropTypes library. See https://fb.me/react-warning-dont-call-proptypes for details.
updating react-router worked for me.
I update react-router from 2.0.0 to 2.6.0 ,and it is ok now
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I update react-router from 2.0.0 to 2.6.0 ,and it is ok now