[MCL-2599] When clicking minecraft world, it doesn't work

When clicking a minecraft world, it doesn't work. A notice pops up about 'error creating loopback socket' and saying to check it isn't blocked by firewall, along with the error report.

I don't know what any of this means or how to fix it.

Related issues

duplicates

MC-34749 Hopper: java.lang.IllegalStateException: failed to create a child event loop - Caused by AntiVirus / Firewall software

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migrated 2014-06-01T08:44:23Z

[media]

migrated 2014-06-01T14:05:42Z

Well, a firewall is basically a block set up by your computer or internet connection. It usually blocks unsafe things, so maybe check your minecraft worlds in your folder and see how much memory you have used up. (sorry it took so long to respond )