Invalid ELF Header

You uploaded your node_modules folder from your computer. Some packages contain compiled code built for Windows or macOS, which can't run on KataBump's Linux servers.

What You See

The error usually mentions a package with native code, such as better-sqlite3, sqlite3, bcrypt, canvas or sharp:

Error: /home/container/node_modules/better-sqlite3/build/Release/better_sqlite3.node: invalid ELF header
  code: 'ERR_DLOPEN_FAILED'

A close cousin appears after changing the Node.js version in the "Startup" tab:

Error: The module '.../better_sqlite3.node' was compiled against a different Node.js version
using NODE_MODULE_VERSION 115. This version of Node.js requires NODE_MODULE_VERSION 127.

How to Fix It

1. Stop the server
2. In the "Files" tab, select the node_modules folder and delete it
3. Check that your package.json is at the root and lists all your dependencies
4. Start the server — KataBump reinstalls the dependencies and builds them for Linux and the selected Node.js version

Don't Upload node_modules

KataBump installs your dependencies automatically from package.json. Uploading node_modules yourself is never needed, and it causes problems:

• Compatibility: native modules built on your computer won't work on Linux (this page)
• Size: node_modules is often hundreds of MB — that's most of the 716 MB of the Free plan, and over the 100 MB web upload limit
• Speed: thousands of tiny files make uploads very slow

When you create your ZIP, leave it out:

my-bot.zip
├── package.json        ✓ upload
├── package-lock.json   ✓ upload
├── index.js            ✓ upload
├── commands/           ✓ upload
└── node_modules/       ✗ leave out