Autocompletion Not working

[ghost]

system: Kali linux 2022.3
shell: zsh ( i use oh-my-zsh Manage zsh）

curl https://raw.githubusercontent.com/cheat/cheat/master/scripts/cheat.zsh --output cheat.zsh
and
edit .zshrc
add source /home/username/.oh-my-zsh/custom/plugins/cheat/cheat.zsh
source ~/.zshrc
end

when i open new shell again
error message:
/home/username/.oh-my-zsh/custom/plugins/cheat/cheat.zsh:65: command not found: compdef

[ghost]

If there is something wrong with my operation process, I hope you guys can point it out.
thanks.

[astrorigin]

To load the missing command, you need this in your .zshrc:

autoload -Uz compinit
compinit -u

[ghost]

@astrorigin
Thanks for your reply, I tried adding these 2 lines to.zshrc

autoload -Uz compinit
compinit -u

Unfortunately, the problem still exists