Problem:
You are getting a popup that says something to the effect of: This computer's local Hostname changed to "example-1.local" is already in use on the network. The name has been changed to "example-50.local".
Solution:
You most likely have your Ethernet cable plugged in, as well as your WiFi turned on. To fix this problem, you need to either unplug your Ethernet cable or turn your WiFi off.