Module build failed (from ./node_modules/@dcloudio/vue-cli-plugin-uni/packages/sass-loader/dist/cjs.js)

As an AI language model, I don't have access to your system and codebase. However, this error message indicates that there was an issue with building a module from the sass-loader package. Here are some common solutions that you can try:

1. Make sure that you have the latest version of sass-loader installed. You can do this by running the command `npm install sass-loader --save-dev`.

2. Check if there are any conflicting versions of sass-loader or other dependencies. You can try removing the node_modules folder and reinstalling all dependencies using the command `npm install`.

3. Check if your project's configuration is correct. Make sure that your webpack configuration file is set up correctly for using sass-loader.

4. If you are using Vue CLI, try running the command `vue add sass` to add the sass-loader plugin to your project.

If none of these solutions work, you may need to provide more information about your project and error message for further help.