title: Hyperledger Explorer Shows Empty Data
body: <p>My Hyperledger composer playground and rest server are working fine, but the explorer shows no data.</p>
  
  <p>Explorer config:</p>
  
  <pre><code>{
  "network-config": {
      "org1": {
          "name": "hlfv1",
          "mspid": "Org1MSP",
          "peer1": {
              "requests": "grpc://localhost:7050",
              "events": "grpc://localhost:7053",
              "server-hostname": "peer0.org1.example.com"
          },
          "admin": {
              "key": "../fabric-tools/fabric-scripts/hlfv1/composer/crypto-config/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp/keystore",
              "cert": "../fabric-tools/fabric-scripts/hlfv1/composer/crypto-config/peerOrganizations/org1.example.com/users/Admin@org1.example.com/msp/signcerts"
          }
  
      }
  },
  "host": "localhost",
  "port": "5000",
  "channel": "composerchannel",
  "keyValueStore": "/tmp/fabric-client-kvs",
  "eventWaitTime": "30000",
  "mysql":{
      "host":"127.0.0.1",
      "database":"fabricexplorer",
      "username":"root",
      "passwd":"******"
  }
  </code></pre>
  
  <p>When I check the log, it shows this error:</p>
  
  <pre><code>[client-utils.js]: sendPeersProposal - Promise is rejected: Error: 12 UNIMPLEMENTED: unknown service protos.Endorser
      at new createStatusError (/blockchain-explorer/node_modules/grpc/src/client.js:65:15)
      at /blockchain-explorer/node_modules/grpc/src/client.js:568:15
  [Channel.js]: Failed Query channel info. Error: Error: 12 UNIMPLEMENTED: unknown service protos.Endorser
      at new createStatusError (/blockchain-explorer/node_modules/grpc/src/client.js:65:15)
      at /blockchain-explorer/node_modules/grpc/src/client.js:568:15
  [ERROR] Query - [39mError: 12 UNIMPLEMENTED: unknown service protos.Endorser
      at new createStatusError (/blockchain-explorer/node_modules/grpc/src/client.js:65:15)
      at /blockchain-explorer/node_modules/grpc/src/client.js:568:15
  [31m[2018-02-08 13:54:07.217] [ERROR] blockscanner -[39mTypeError: Cannot read property 'low' of undefined
      at getChainInfo.then.response (/blockchain-explorer/app/query.js:208:33)
      at &lt;anonymous&gt; ....
  </code></pre>
  
  <p>IS there anything wrong with the config? There's no clear tuto about how to integrate explorer with composer. Thanks</p>