Not able to install nginx using brew in mac m1

I am trying to install nginx in my MacBook Air m1, returning this error....

fatal: Could not resolve HEAD to a revision

Updating Homebrew...

==> Auto-updated Homebrew!

Updated 1 tap (homebrew/cask).

==> Updated Casks

Updated 4 casks.

Warning: No available formula or cask with the name "nginx".

==> Searching for similarly named formulae...

Error: No similarly named formulae found.

==> Searching for a previously deleted formula (in the last month)...

Error: No previously deleted formula found.

==> Searching taps on GitHub...

Error: No formulae found in taps.