Webpack error

gistfile1.txt

 ERROR in ./src/styles/app.scss
    Module build failed: Error: "/icons/icons.json" is not in the SourceMap.
        at BasicSourceMapConsumer.SourceMapConsumer_sourceContentFor [as sourceContentFor] (/src/node_modules/source-map/lib/source-map-consumer.js:704:13)
        at SourceMapGenerator.<anonymous> (/src/node_modules/source-map/lib/source-map-generator.js:235:40)
        at Array.forEach (native)
        at SourceMapGenerator_applySourceMap [as applySourceMap] (/src/node_modules/source-map/lib/source-map-generator.js:234:32)
        at MapGenerator.applyPrevMaps (/src/node_modules/postcss/lib/map-generator.js:144:22)
        at MapGenerator.generateMap (/src/node_modules/postcss/lib/map-generator.js:205:46)
        at MapGenerator.generate (/src/node_modules/postcss/lib/map-generator.js:308:25)
        at LazyResult.stringify (/src/node_modules/postcss/lib/lazy-result.js:290:24)
        at /src/node_modules/postcss/lib/lazy-result.js:227:27
        at <anonymous>
     @ multi ./src/js/app.js ./src/styles/app.scss