Invalid PostCSS plugin error while deploying next js site to vercel - next.js

Question

I am trying to deploy a site built with next js ( and with tailwindcss) to vercel.But I keep getting this '' Invalid PostCSS Plugin" error".
Error shown in the vercel log
Works completely fine locally.
I'm trying to deploy the site by importing from github.
My postcss.config.js
module.exports = {
plugins: ['postcss-import', 'tailwindcss', 'autoprefixer']
}
My package.json
{
"name": "community-site",
"version": "1.0.0",
"description": "website for Education and Sports Club",
"main": "index.js",
"dependencies": {
"autoprefixer": "^9.8.4",
"axios": "^0.19.2",
"cosmicjs": "^3.2.48",
"express": "^4.17.1",
"lodash": "^4.17.19",
"moment": "^2.27.0",
"next": "^9.4.4",
"npm-run-all": "^4.1.5",
"postcss-cli": "^7.1.1",
"postcss-import": "^12.0.1",
"react": "^16.13.1",
"react-dom": "^16.13.1",
"react-toastify": "^6.0.8",
"tailwindcss": "^1.4.6"
},
"devDependencies": {
"nodemon": "^2.0.4"
},
"scripts": {
"build:tailwind": "postcss styles/tailwind.css -o styles/tailwind.generated.css",
"watch:tailwind": "postcss -w styles/tailwind.css -o styles/tailwind.generated.css",
"start": "run-p watch:tailwind start:next",
"start:next": "next start",
"dev": "next",
"prebuild": "npm run build:tailwind",
"build": "next build"
},
"author": "Salvator",
"license": "ISC"
}