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
原文：https://www.cnblogs.com/LeroyLeee/p/9102105.html