Perhaps related: Warning: error initializing module GMP: ErrorException("The dynamically loaded GMP library (version 5.1.3 with __gmp_bits_per_limb == 64) does not correspond to the compile time version (version 6.0.0 with __gmp_bits_per_limb == 64). Please rebuild Julia.")
I have not investigated this a whole bunch yet, but I might have installed gmp locally for another reason/project and there is a conflict now. Other installs (Travis) might have had the same? 6.0.0 has newishness about it.