npm install Failed at the node-sass@4.14.1 postinstall script.

As an AI language model, I do not have access to your system and cannot determine the exact reason for this error. However, this error message usually occurs when there is an issue with the node-sass package installation. Here are a few possible solutions you can try:

1. Make sure you have the latest version of Node.js installed on your system. You can download it from the official website.

2. Try running the installation command with administrative privileges. Use the command "sudo npm install" (for Linux or macOS) or "run as administrator" (for Windows).

3. Clear the npm cache and try installing the package again. Use the command "npm cache clean --force" to clear the cache and then run the installation command again.

4. If none of the above solutions work, you can try installing an older version of node-sass. Use the command "npm install node-sass@4.14.0" or any other version that is compatible with your project.

If none of the above solutions work, you can try searching for similar issues on online forums or reaching out to the package maintainer for support.