---
title: "The package could not be installed. The theme is missing the style.css stylesheet."
source: "https://docs.nexcess.com/software/kadence/the-package-could-not-be-installed-the-theme-is-missing-the-style-css-stylesheet/"
description: "Why this happens This error appears when you try to upload a plugin file in the Themes section. WordPress expects a style.css file inside every theme, so if the…"
vertical: "Software"
area: "Kadence"
date: "2025-10-06"
last_modified: "2026-07-02"
---

# The package could not be installed. The theme is missing the style.css stylesheet.

### **Why this happens**

This error appears when you try to upload a **plugin file** in the **Themes** section. WordPress expects a `style.css` file inside every theme, so if the uploaded file doesn’t contain one, the installation fails.

### **How to fix it**

1. Make sure you’re uploading a **theme** file, not a plugin. 
    - Theme files are installed under **Appearance → Themes → Add New**.
    - Plugin files are installed under **Plugins → Add New**.

### **Tip**

If you meant to install a plugin, upload it through **Plugins → Add New** instead.

![](https://docs.nexcess.com/wp-content/uploads/2026/06/Plugins-‹-test-—-WordPress-2025-10-06-at-8.19.41-AM.jpg)