Cannot read property 'introduce' of null

TypeError: Cannot read property 'introduce' of null
    at introduce (/data/node_site/www.huoxing24.com.temp/node/server/build/webpack:/assets/containers/UserCenter/UserCenterHeader/index.js:33:71)
    at c (/data/node_site/www.huoxing24.com.temp/node/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:33:501)
    at Sa (/data/node_site/www.huoxing24.com.temp/node/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:36:1)
    at a.render (/data/node_site/www.huoxing24.com.temp/node/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:41:467)
    at a.read (/data/node_site/www.huoxing24.com.temp/node/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:41:58)
    at renderToString (/data/node_site/www.huoxing24.com.temp/node/node_modules/react-dom/cjs/react-dom-server.node.production.min.js:53:83)
    at _callee$ (/data/node_site/www.huoxing24.com.temp/node/server/build/webpack:/server/render/render.js:250:34)
    at tryCatch (/data/node_site/www.huoxing24.com.temp/node/node_modules/regenerator-runtime/runtime.js:45:40)
    at Generator.invoke [as _invoke] (/data/node_site/www.huoxing24.com.temp/node/node_modules/regenerator-runtime/runtime.js:271:22)
    at Generator.prototype.<computed> [as next] (/data/node_site/www.huoxing24.com.temp/node/node_modules/regenerator-runtime/runtime.js:97:21)