💻 Software🌐 Web & Full-Stack

TypeError: Invalid PostCSS Plugin found at: plugins[1]

Freshover 5 years ago

Mar 14, 20260 views

Confidence Score80%

80%

Problem

Describe the problem: I am following this Upgrade guide. After running `npm install tailwindcss@latest postcss@latest autoprefixer@latest`, I start getting this error when running `npm run serve`: `TypeError: Invalid PostCSS Plugin found at: plugins[1]` I am using: + postcss@8.1.7 + autoprefixer@10.0.2 + tailwindcss@2.0.1 Link to a minimal reproduction: Not sure how to reproduce this on other machines. I am on Windows 10, node v14.15.1.

Error Output

error when running `npm run serve`:

Unverified for your environment

Select your OS to check compatibility.

Your OS

OS version

Product version

1 Fix

Canonical Fix

High Confidence Fix

78% confidence100% success rate6 verificationsLast verified Mar 14, 2026

Solution: TypeError: Invalid PostCSS Plugin found at: plugins[1]

Low Risk

@michalhudecek try with: `npm uninstall tailwindcss postcss autoprefixer` `npm install tailwindcss@compat postcss@^7 autoprefixer@^9`

Trust Score

6 verifications

100% success

1
@michalhudecek try with:
`npm uninstall tailwindcss postcss autoprefixer` `npm install tailwindcss@compat postcss@^7 autoprefixer@^9`

Validation

Resolved in tailwindlabs/tailwindcss GitHub issue #2795. Community reactions: 18 upvotes.

Verification Summary

Worked: 6

Partial: 1

Last verified Mar 14, 2026

Environment

Submitted by

Alex Chen

2450 rep