Ethereum Mist crashes when reopening

Question

The setup of Ethereum Mist worked like a charm (MacOS). Then, I tried to connect to a test Network but the program crashed and continues to do so.

How can I fix this issue?

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Node type: geth

Network: main

Platform: darwin (Architecure x64)

...eum/geth/ethash count=3
INFO [10-14|17:34:19] Disk storage enabled for ethash DAGs     dir=/Users/stefanschares/.ethash                      count=2
INFO [10-14|17:34:19] Initialising Ethereum protocol           versions="[63 62]" network=1
INFO [10-14|17:34:19] Loaded most recent local header          number=4362351 hash=188b4f…0c8c34 td=1174172911787544706344
INFO [10-14|17:34:19] Loaded most recent local full block      number=0       hash=d4e567…cb8fa3 td=17179869184
INFO [10-14|17:34:19] Loaded most recent local fast block      number=4362114 hash=d11d53…f16574 td=1173445059230676622547
INFO [10-14|17:34:19] Upgrading chain index                    type=bloombits percentage=0
INFO [10-14|17:34:19] Loaded local transaction journal         transactions=0 dropped=0
INFO [10-14|17:34:19] Regenerated local transaction journal    transactions=0 accounts=0
INFO [10-14|17:34:19] Starting P2P networking 
Fatal: Error starting protocol stack: listen udp :30303: bind: 
address already in use

Answer 1

It is impossible to be sure with the information you have provided, but please check that Mist isn't trying to use a port that is already in use. This is the most common issue that causes the Mist client to crash - namely port 30303.

You can find other common issues and fixes here:

https://github.com/ethereum/wiki/wiki/Mist-Troubleshooting-Guide

Answer 2

It clearly states

Fatal: Error starting protocol stack: listen udp :30303: bind: address already in use

It is possible you have another instance running. Try a fresh reboot to ensure any instances are closed.