Eclipse can't find RoboRIO

[1452-Leo]

We have been having trouble uploading code to the RoboRIO when connected over wifi. It works fine through ethernet, but wifi gives this error:

get-target-ip:
        [echo] Trying Target: roboRIO-1452.local
Unknown host: roboRIO-1452.local
        [echo]  roboRIO not found via mDNS, falling back to static USB
        [echo] roboRIO not found via USB, falling back to static address of 10.14.52.2

BUILD FAILED
/Users/*****/wpilib/cpp/current/ant/build.xml:45: Assertion failed boolean test.
roboRIO not found, please check that the roboRIO is connected, imaged and that the team number is set properly in Eclipse

Does anyone know what could be causing this? We've had the same result with two different Macs. We also tried pinging roboRIO-1452.local and nothing came up. Thanks!