设置marbles . step 4 error error: Caught exception: TypeError: Cannot read property 'getConnectivityState' of undefined

参考链接：https://github.com/IBM-Blockchain/marbles/issues/220

error: Caught exception:  TypeError: Cannot read property 'getConnectivityState' of undefined

    at EventHub._checkConnection (/Users/lishun/app/marbles/node_modules/_fabric-client@1.0.5@fabric-client/lib/EventHub.js:471:38)

    at EventHub.registerTxEvent (/Users/lishun/app/marbles/node_modules/_fabric-client@1.0.5@fabric-client/lib/EventHub.js:713:8)

    at setup_event_hub (/Users/lishun/app/marbles/utils/fc_wrangler/parts/invoke_cc.js:125:14)

    at Object.invoke_cc.invoke_chaincode (/Users/lishun/app/marbles/utils/fc_wrangler/parts/invoke_cc.js:52:3)

    at Object.fcw.invoke_chaincode (/Users/lishun/app/marbles/utils/fc_wrangler/index.js:57:13)

    at Object.marbles_chaincode.register_owner (/Users/lishun/app/marbles/utils/marbles_cc_lib.js:230:7)

    at Object.startup_lib.create_owners (/Users/lishun/app/marbles/utils/startup_lib.js:260:15)

    at /Users/lishun/app/marbles/utils/startup_lib.js:211:17

    at /Users/lishun/app/marbles/node_modules/_async@2.5.0@async/dist/async.js:3083:16

    at eachOfArrayLike (/Users/lishun/app/marbles/node_modules/_async@2.5.0@async/dist/async.js:1003:9)

debug: [ws] broadcasting to clients.  1 error

参考链接解决如下：

npm uninstall grpc

rm -rf node_modules/

npm install