FYI, I have found the RandomSample[] function to fail using OS X version 10.3.0 of Mathematica. There is no 10.3.1 for this platform, however the 10.3.1 that exist for the Raspberry Pi and also the OS X 10.4.1 version execute the function without a problem.
Failure[Message: Expression of the form RandomSample[{__Association}] cannot be evaluated.
Tag: Dataset]
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