Install problems after installing UI plugin

[Therrapy]

Hi I finally managed to get Tailwind CSS installed with react, I followed a lot of tutorials even the smash magazine one and it did not work, I kept getting:

postcss' is not recognized as an internal or external command

I read on a forum that I had to rollback autoprefixer that fixed it and everything was working, I then went and installed the UI plugin and the same error has now come up again

'postcss' is not recognized as an internal or external command,
operable program or batch file.

build:css: postcss src/styles/tailwind.css -o src/styles/main.css
npm ERR! Exit status 1

failed at the [email protected] build:css script.

I hope someone can help, it has been a hard 2 days, and I'm at a loss.

Thanks