I get a command not found from my bashrc

When I try and go to the .ssh directory with cd ~/.ssh it correctly navigates to that directory but I get a __git ps1: command not found. Not sure why this is happening and how to resolve the issue.

here is my bashrc file

#Git tab completion
source ~/git-completion.bash
# Show branch in status line
PS1='[\W$(__git_ps1 " (%s)")]\$ '
export PROMPT_COMMAND='echo -ne "\033]0;${PWD/#$HOME/~}\007"'

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