Cloud9 failure, exit code 100, possibly relate to tmux(?)

Question

I am new to cloud9. Just created an environment and opened it. It seems installing several things to my EC2 (which I usually access using ssh from my PC at home) but eventually left below message in red and obviously failed. How can I fix this?
(message)
(~)/.c9/bin/tmux: error while loading shared libraries: libevent-2.1.so.7: cannot open shared object file: No such file or directory
Installed tmux does not appear to work:
exiting with 100

Failed Bash. Exit code 100.

One or more errors occured. Please try to resolve them and restart AWS Cloud9 or visit https://forums.aws.amazon.com/forum.jspa?forumID=268
(end of message)

Any information is welcome please.

Answer

Hello, thank you for reaching out here.
If you are creating a SSH Cloud9 Environment (e.g. connecting to existing EC2 instance in personal account), please follow steps in this user guide https://docs.aws.amazon.com/cloud9/latest/user-guide/ssh-settings.html to make sure that required system libraries are available to connect to instance with Cloud9.
If problems persist, we recommend to create new EC2 Cloud9 environment.

Cloud9 failure, exit code 100, possibly relate to tmux(?)

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