Failed to install via brew

[johnslai]

$ brew install MisterTea/et/et
==> Auto-updating Homebrew...
Adjust how often this is run with HOMEBREW_AUTO_UPDATE_SECS or disable with
HOMEBREW_NO_AUTO_UPDATE. Hide these hints with HOMEBREW_NO_ENV_HINTS (see man brew).
==> Fetching mistertea/et/et
==> Downloading https://github.com/MisterTea/EternalTerminal/archive/et-v6.2.8.tar.gz
Already downloaded: /Users/jlai5/Library/Caches/Homebrew/downloads/5f7c34f4e33b4d529fbecda225fc6f49931603bbbc263f4ac8d0f960f52c1019--EternalTerminal-et-v6.2.8.tar.gz
==> Installing et from mistertea/et
==> cmake . -DDISABLE_VCPKG:BOOL=ON -DPYTHON_EXECUTABLE=/usr/bin/python3
==> make install
Error: An exception occurred within a child process:
NoMethodError: undefined method `exists?' for class File