Software⏱️ 2 min read📅 2026-05-30

How to Fix: Running `npm run wp-dev` fails with "Invalid Argument" error

Quick Answer: Check the npm script in your package.json to ensure it's correctly formatted and that the wp-dev command is being called with the correct arguments.

📋 Table of Contents

  1. ⚠️ Common Causes
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

Running `npm run wp-dev` fails with an "Invalid Argument" error due to a mismatch in the directory path. The issue arises when the `wp-config.php` file is not properly configured or the WordPress root directory is not set correctly.

⚠️ Common Causes

  • Incorrect `WP_HOME` or `WP_SITEURL` settings in the `wp-config.php` file.

🔧 Proven Troubleshooting Steps

Method 1: Check wp-config.php file

  1. Step 1: Open the `wp-config.php` file in a code editor and verify that the `WP_HOME` and `WP_SITEURL` settings are correct.

Method 2: Update WordPress root directory

  1. Step 1: Run `npm run build` to create the WordPress root directory.

🎯 Final Words

To resolve the issue, ensure that your `wp-config.php` file is correctly configured and the WordPress root directory is set to the correct path. If you're still experiencing issues, try updating the `WP_HOME` and `WP_SITEURL` settings in the `wp-config.php` file.

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