Module build failed: SyntaxError: /Users/xxx/package.json: Error while parsing JSON - Unexpected end of JSON input

ERROR in ./app/App.js
Module build failed: SyntaxError: /Users/xuyejian/package.json: Error while parsing JSON - Unexpected end of JSON input
at Object.parse (native)
at OptionManager.addConfig (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-core/lib/transformation/file/options/option-manager.js:200:62)
at OptionManager.findConfigs (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-core/lib/transformation/file/options/option-manager.js:419:30)
at OptionManager.init (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-core/lib/transformation/file/options/option-manager.js:461:12)
at File.initOptions (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-core/lib/transformation/file/index.js:194:75)
at new File (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-core/lib/transformation/file/index.js:123:22)
at Pipeline.transform (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-core/lib/transformation/pipeline.js:45:16)
at transpile (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-loader/index.js:38:20)
at Object.module.exports (/Users/xxx/Downloads/kanban-app-chapter5/node_modules/babel-loader/index.js:131:12)
@ multi main