CodeSandbox "Only a Max of 250 Modules Is Allowed" Import Error

How to fix it

Try these in order — the most common fix is first.

1. 1. Trim the project before importing

   Copy steps
   1. Make sure node_modules and build folders are in .gitignore and not committed
   2. Import only the subfolder you need, or a smaller example
   Did this fix it? Yes No

2. 2. Use a VM Sandbox instead

   1. Create a VM Sandbox from the repository so the project runs in a full environment rather than the browser bundler
   Did this fix it? Yes No

Symptoms

Import fails with "Only a max of 250 modules is allowed in a sandbox".

Why it happens

• Repo has too many files for a Browser Sandbox
• Build or dependency folders included in the import

This guide also covers

• codesandbox only a max of 250 modules
• codesandbox import github error

The same problem in other apps

All not loading, error messages & connection guides →

• StackBlitz "Cannot load native addon because loading addons is disabled" (StackBlitz)
• Codespace Running in Recovery Mode: "This codespace is currently running in recovery mode due to a container error" (GitHub Codespaces)
• Replit Workspace Not Loading (Replit)
• Ona AWS Runner Failed: ROLLBACK_COMPLETE and ECS Circuit Breaker Errors (Gitpod)

Other CodeSandbox errors

• CodeSandbox 502 "Dev Server Has Not Started Yet" Error
• CodeSandbox Not Loading or Not Starting
• CodeSandbox VM Frozen: Credits Ran Out
• CodeSandbox Preview Not Showing for Private Sandbox
• CodeSandbox "Request Entity Too Large" Error on Import or Commit
• CodeSandbox "Could Not Find Dependency" Error
• CodeSandbox VM Slow or Out of Memory
• CodeSandbox Private Sandboxes on the Free Plan