[MC-59311] Connection lost to single player world!?

Im trying to enter my world,as I double-click it,instead of doing the "loading terrain" or something,it doesn't show it and the screen is with out any text,then this pops up....View picture to see it better?

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user-39947 2014-06-26T22:55:15Z

After I clicked it, it took me to multiplayer?

CubeTheThird 2014-06-26T23:14:07Z

Please attach the complete output of the "Development console" which can be found on the second tab of the launcher.
If the launcher closes after game start, please edit your profile and select "Launcher visibility" then, "Keep the launcher open".