Maybe its an issue about the version I am using, but if the above code does not work for you, try this:
set -g prefix C-a
unbind-key C-b
bind-key C-a send-prefix
Maybe its an issue about the version I am using, but if the above code does not work for you, try this:
set -g prefix C-a
unbind-key C-b
bind-key C-a send-prefix