Slightly more verbose error message
Slightly more verbose error message

cloudera/impyla,mariusvniekerk/impyla,wesm/impyla,mariusvniekerk/impyla,wesm/impyla,mariusvniekerk/impyla,laserson/impyla-old,laserson/impyla,bhtucker/impyla,cloudera/impyla,laserson/impyla,schaffino/impyla,schaffino/impyla,bhtucker/impyla,bhtucker/impyla