Mac spark-shell Error initializing SparkContext

Question

I tried to start spark 1.6.0 (spark-1.6.0-bin-hadoop2.4) on Mac OS Yosemite 10.10.5 using

\"./bin/spark-shell\". 

It has the error below.

Answer 1

I always get that when switching between networks. This solves it:

$ sudo hostname -s 127.0.0.1