将模块导入主 app.module 时创建了 angular2 功能模块，出现以下错误
modules.js?hash=83df0dc…:35050 Uncaught TypeError: Cannot read property 'replace' of undefinedextractStyleUrls @ modules.js?hash=83df0dc…:35050(anonymous function) @ modules.js?hash=83df0dc…:38274DirectiveNormalizer.normalizeStylesheet @ modules.js?hash=83df0dc…:38273DirectiveNormalizer.normalizeLoadedTemplate @ modules.js?hash=83df0dc…:38203DirectiveNormalizer.normalizeTemplateSync @ modules.js?hash=83df0dc…:38178DirectiveNormalizer.normalizeTemplate @ modules.js?hash=83df0dc…:38155CompileMetadataResolver._loadDirectiveMetadata @ modules.js?hash=83df0dc…:42474(anonymous function) @ modules.js?hash=83df0dc…:42650CompileMetadataResolver.loadNgModuleDirectiveAndPipeMetadata @ modules.js?hash=83df0dc…:42649(anonymous function) @ modules.js?hash=83df0dc…:51875JitCompiler._loadModules @ modules.js?hash=83df0dc…:51874JitCompiler._compileModuleAndComponents @ modules.js?hash=83df0dc…:51829JitCompiler.compileModuleAsync @ modules.js?hash=83df0dc…:51795PlatformRef_._bootstrapModuleWithZone @ modules.js?hash=83df0dc…:61199PlatformRef_.bootstrapModule @ modules.js?hash=83df0dc…:61174(anonymous function) @ main.ts:10maybeReady @ meteor.js?hash=e3f53db…:809loadingCompleted @ meteor.js?hash=e3f53db…:821
我是 Angular 2 和流星的新手，请帮助我。