[MC-82514] try to log into my world and it crashes

I can sign into minecraft and when I go to loggin to my world the "oops sorry the game crashed"
What I expected to happen was...:
Describe what you thought should happen here

What actually happened was...:
Describe what happened here

Steps to Reproduce:
1. Put a step by step guide on how to trigger the bug here
2. ...
3. ...

Related issues

duplicates

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

Attachments

crash-2015-07-19_11.19.44-client.txt

Comments

migrated 2015-07-20T00:27:27Z

[media]

migrated 2015-07-20T00:27:38Z

Incomplete without a crash report ([minecraft|http://hopper.minecraft.net/help/finding-minecraft-data-folder]/crash-reports/crash-<DATE>-client.txt). Please attach it so that we can diagnose your issue.
For technical support please use the Mojang Support Center.

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migrated 2015-07-20T00:40:32Z

cannot loggin to my world without this stopping me