[MC-60872] Error conect to the server!

I have an problem.
I want to join in a server, an tell me:
internal exception java.lang.classcastexception bll cannot be cast to fv
I am panicked!
Is my favorite server were I am admin!!

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Comments 2

user-f2760 2014-07-07T18:00:10Z

force a crash by pressing f3+c for 10 seconds

kumasasa 2014-07-07T21:21:06Z

After having this issue: 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".