Error : File to import not found or unreadable: node_modules/office-ui-fabric-core/dist/sass/variables/Font.Variables.
Your web part.module.scss has import statement i.e.
@import '~@microsoft/sp-office-ui-fabric-core/dist/sass/SPFabricCore.scss';
By default this package has not been installed. So you have to install this package :
npm install @microsoft/sp-office-ui-fabric-core –save
Then your import statement will work.
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