npm ERR! Failed at the node-sass@4.7.2 postinstall script.

This error typically occurs when there is an issue with the postinstall script of the node-sass package. There are a few possible solutions you can try:

1. Clear the npm cache and reinstall: Run the following commands in your project directory:

   npm cache clean --force
   npm install node-sass@4.7.2

2. Manually rebuild node-sass: Sometimes, the issue can be resolved by manually rebuilding the node-sass package. Run the following command:

   npm rebuild node-sass@4.7.2

3. Check for compatibility issues: Make sure that the version of node-sass you are trying to install is compatible with your Node.js version. You can check the compatibility matrix on the node-sass GitHub repository.

If none of these solutions work, please provide more details about your setup and any other error messages you encountered so that I can assist you further.