I suspect that's the same library that caused the warning for bHogan. Thanks!
There is a branch of that library specifically for Arduino IDE 1.5 and later: GitHub - ntruchsess/arduino_uip at Arduino_1.5.x. It has a valid version and also has the "Invalid Category" warning fixed. Note that the author has forgotten to update the version value in library.properties. The last release of that branch is actually at 1.59 instead of the 1.50 stated in library.properties.