Command not found ZSH Error after updating zshrc file - macos

I recently updated some applications and now it is giving me error when I open any new tab in teminal.
Error it is giving:
/Users/priti/.oh-my-zsh/lib/completion.zsh:28: command not found:
whoami /Users/priti/.oh-my-zsh/lib/theme-and-appearance.zsh:10:
command not found: uname
/Users/priti/.oh-my-zsh/lib/theme-and-appearance.zsh:14: command not
found: uname getent:4: command not found: grep
I am sure something is wrong with the updated zshrc file, but I am not able to figure out what exactly the problem in that.
Problems I have faced till now are vi and grepcommand not working.For both output is command not found.
Thanks in advance for the same.

Reinstalling zsh solved the problem.
Some steps I followed after brew update might have caused this problem.

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