When upgrading tmux versions (e.g., from 3.5 to 3.6a), you may encounter an "open terminal failed: not a terminal" error when trying to attach to existing sessions. This happens due to incompatibilities between the old tmux server and the upgraded client. The solution is to run `tmux kill-server` and restart tmux. You can use tmux resurrect to restore your previous sessions after the restart.
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