Fetching Chromium returns "file does not exist" error

Question

I'm working on a Chromium fork and I'm getting started on Git Bash with these instructions. However, when I do fetch chromium --nohooks --no-history, Git Bash returns:

[E2021-06-07T14:19:27.044872-07:00 13524 0 annotate.go:273] original error: file does not exist

goroutine 1:
#0 go.chromium.org/luci/vpython/python/interpreter.go:120 - python.(*Interpreter).GetVersion()
#1 go.chromium.org/luci/vpython/venv/config.go:286 - venv.(*Config).resolvePythonInterpreter()
  reason: failed to determine Python version for: C:\Users\carpe\Downloads\NextgenusBrowser\depot_tools\\\python3.exe

#2 go.chromium.org/luci/vpython/venv/config.go:186 - venv.(*Config).makeEnv()
  reason: failed to resolve system Python interpreter

#3 go.chromium.org/luci/vpython/venv/venv.go:150 - venv.With()
  reason: failed to initialize empty probe environment

#4 go.chromium.org/luci/vpython/run.go:62 - vpython.Run()
#5 go.chromium.org/luci/vpython/application/application.go:320 - application.(*application).mainImpl()
#6 go.chromium.org/luci/vpython/application/application.go:408 - application.(*Config).Main.func1()
#7 go.chromium.org/luci/vpython/application/support.go:46 - application.run()
#8 go.chromium.org/luci/vpython/application/application.go:407 - application.(*Config).Main()
#9 vpython/main.go:110 - main.mainImpl()
#10 vpython/main.go:116 - main.main()
#11 runtime/proc.go:225 - runtime.main()
#12 runtime/asm_amd64.s:1371 - runtime.goexit()

I've installed depot_tools and have troubleshooted by searching the internet but I have no idea what the problem is. Can anyone help?