老師，最后運行時報錯了是什么原因，報錯代碼如下：

ERROR in ./src/app.vue

Module build failed: SyntaxError: Unexpected token {

? ? at exports.runInThisContext (vm.js:53:16)

? ? at Module._compile (module.js:373:25)

? ? at Object.Module._extensions..js (module.js:416:10)

? ? at Module.load (module.js:343:32)

? ? at Function.Module._load (module.js:300:12)

? ? at Module.require (module.js:353:17)

? ? at require (internal/module.js:12:17)

? ? at Object.<anonymous> (E:\something\vue-test\node_modules\vue-loader\index.js:1:80)

? ? at Module._compile (module.js:409:26)

? ? at Object.Module._extensions..js (module.js:416:10)

? ? at Module.load (module.js:343:32)

? ? at Function.Module._load (module.js:300:12)

? ? at Module.require (module.js:353:17)

? ? at require (internal/module.js:12:17)

? ? at loadLoader (E:\something\vue-test\node_modules\webpack\node_modules\loader-runner\lib\loadLoader.js:13:17)

? ? at iteratePitchingLoaders (E:\something\vue-test\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:169:2)

? ? at runLoaders (E:\something\vue-test\node_modules\webpack\node_modules\loader-runner\lib\LoaderRunner.js:362:2)

? ? at NormalModule.doBuild (E:\something\vue-test\node_modules\webpack\lib\NormalModule.js:182:3)

? ? at NormalModule.build (E:\something\vue-test\node_modules\webpack\lib\NormalModule.js:275:15)

? ? at Compilation.buildModule (E:\something\vue-test\node_modules\webpack\lib\Compilation.js:151:10)

? ? at factoryCallback (E:\something\vue-test\node_modules\webpack\lib\Compilation.js:344:12)

? ? at E:\something\vue-test\node_modules\webpack\lib\NormalModuleFactory.js:241:5

? ? at E:\something\vue-test\node_modules\webpack\lib\NormalModuleFactory.js:94:13

? ? at E:\something\vue-test\node_modules\webpack\node_modules\tapable\lib\Tapable.js:268:11

? ? at NormalModuleFactory.<anonymous> (E:\something\vue-test\node_modules\webpack\lib\CompatibilityPlugin.js:52:5)

? ? at NormalModuleFactory.applyPluginsAsyncWaterfall (E:\something\vue-test\node_modules\webpack\node_modules\tapable\lib\Tapable.js:272:13)

? ? at E:\something\vue-test\node_modules\webpack\lib\NormalModuleFactory.js:69:10

? ? at E:\something\vue-test\node_modules\webpack\lib\NormalModuleFactory.js:194:7

? ? at nextTickCallbackWith0Args (node.js:420:9)

? ? at process._tickCallback (node.js:349:13)

?@ ./src/index.js 2:0-27