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To resolve the issue of compiling SASS for Bootstrap after upgrading to React 18, you can follow these steps:

1. Make sure you have the latest version of Bootstrap installed (version 5 or higher)

2. Update your SASS compiler to the latest version

3. Review your SASS files for any outdated syntax or variables that may be causing the issue

4. Check the console log for any error messages related to SASS compilation and try to fix them accordingly

5. If none of the above works, consider switching to a different CSS preprocessor (such as LESS or Stylus) or using the pre-compiled CSS files provided by Bootstrap, instead of compiling your own from SASS.