I recently installed Tmux and became really glad for it. All of a sudden I though it would start throwing an error when I try to create a new session from within my terminal:

tmux new -s my-session

will cause the application to crash and only return


and put the following on the next command line:


Being new to Tmux I have no idea how to fix this issue. Does anybody recognize this error and knows how to fix it?



set-option -g default-command "reattach-to-user-namespace -l zsh"

from the configuration fixed the problem for me.

  • Seems to me as specific problem, Wasn't 62;9;c the line & column index in configuration file where error raised?
    – user.dz
    Apr 3 '14 at 8:54
  • Does this pinpoint the location in the config where it encountered an error?
    – Severin
    Apr 3 '14 at 9:01
  • I don't know, but I'm asking if you know? or you can confirm if so?
    – user.dz
    Apr 3 '14 at 9:21
  • 1
    Just checked and the error occured on line 27, so nothing to go on from 62;9;c
    – Severin
    Apr 3 '14 at 9:23

I ran into this problem, and the reason was that the shell path was wrong in my .tmux.conf

set -g default-shell /usr/local/bin/fish

It couldn't find the shell, so it crashed. You should probably check whether your default shell's path is correct.

  • 1
    your answer isn't clear... what is the correct path?
    – 24601
    Aug 17 '15 at 8:24
  • 1
    use the command which to locate where the file is, for example: which fish
    – Syl
    Aug 19 '15 at 20:24

First, I uninstalled tmux and removed its config file .tmux.conf. The thing that worked for me was deleting tmp/tmux-1000 directory, and then installing tmux again. It seemed to me that tmux was using the default file present in tmp/tmux-1000 directory every time it was being started and very importantly this directory is not being deleted on uninstalling tmux

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