Unexpected identifier in composer-common/lib/cardstore/businessnetworkcardstore.js:54

c错误描述

Unexpected identifier in composer-common/lib/cardstore/businessnetworkcardstore.js:54

　　

yo hyperledger-composer:businessnetwork

/home/xuzheng/.nvm/versions/node/v6.6.0/lib/node_modules/generator-hyperledger-composer/node_modules/composer-common/lib/cardstore/businessnetworkcardstore.js:54
    async get(cardName) {
          ^^^
SyntaxError: Unexpected identifier
    at Object.exports.runInThisContext (vm.js:76:16)
    at Module._compile (module.js:528:28)
    at Object.Module._extensions..js (module.js:565:10)
    at Module.load (module.js:473:32)
    at tryModuleLoad (module.js:432:12)
    at Function.Module._load (module.js:424:3)
    at Module.require (module.js:483:17)
    at require (internal/module.js:20:19)
    at Object.<anonymous> (/home/xuzheng/.nvm/versions/node/v6.6.0/lib/node_modules/generator-hyperledger-composer/node_modules/composer-common/index.js:56:43)
    at Module._compile (module.js:556:32)

　　解决方案：

 you do not have Node.js 8 installed; Composer has required Node.js 8 since before v0.16.x. Please upgrade your version of Node.js to 8.x.