Error in last step of the setup

[jimw-99]

When I run node server.js, I get the following message:

Error: Invalid JSON RPC response: undefined
at Object.InvalidResponse (C:\Users\backu\blockchain\Blockchain4LinkedData-master\Dapp\node_modules\web3\lib\web3\errors.js:35:16)
at HttpProvider.send (C:\Users\backu\blockchain\Blockchain4LinkedData-master\Dapp\node_modules\web3\lib\web3\httpprovider.js:91:22)
at RequestManager.send (C:\Users\backu\blockchain\Blockchain4LinkedData-master\Dapp\node_modules\web3\lib\web3\requestmanager.js:58:32)
at Eth.send [as getBlock] (C:\Users\backu\blockchain\Blockchain4LinkedData-master\Dapp\node_modules\web3\lib\web3\method.js:145:58)
at Object. (C:\Users\backu\blockchain\Blockchain4LinkedData-master\Dapp\app\routes.js:31:22)
at Module._compile (internal/modules/cjs/loader.js:1063:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1092:10)
at Module.load (internal/modules/cjs/loader.js:928:32)
at Function.Module._load (internal/modules/cjs/loader.js:769:14)
at Module.require (internal/modules/cjs/loader.js:952:19)

Could you help me with that?