在hypeledger-samples fabcar示例中运行命令节点query.js时出现错误，
root @ ubcourt：/ home / fabric-samples / fabcar / javascript＃节点query.js
钱包路径：/ home / fabric-samples / fabcar / javascript / wallet2019-08-03T08：45：31.027Z-错误：[Channel.js]：频道：mychannel收到发现错误：访问被拒绝
2019-08-03T08：45：31.028Z-错误：[Channel.js]：错误：频道：我的频道发现错误：访问被拒绝
2019-08-03T08：45：31.040Z-错误：[Channel.js]：频道：mychannel收到发现错误：访问被拒绝
2019-08-03T08：45：31.040Z-错误：[Channel.js]：错误：频道：mychannel发现错误：访问被拒绝
2019-08-03T08：45：31.042Z-错误：[网络]：_initializeInternalChannel：无法初始化频道。尝试联系2个对等方。最后一个错误是错误：频道：mychannel发现错误：访问被拒绝在Channel._discover（/home/fabric-samples/fabcar/javascript/node_modules/fabric-client/lib/Channel.js:1272:11）在异步Channel._initialize（/home/fabric-samples/fabcar/javascript/node_modules/fabric-client/lib/Channel.js:291:32）在异步Channel.initialize（/home/fabric-samples/fabcar/javascript/node_modules/fabric-client/lib/Channel.js:244:14）在异步Network._initializeInternalChannel（/home/fabric-samples/fabcar/javascript/node_modules/fabric-network/lib/network.js:105:5）在异步Network._initialize（/home/fabric-samples/fabcar/javascript/node_modules/fabric-network/lib/network.js:130:3）在异步Gateway.getNetwork（/home/fabric-samples/fabcar/javascript/node_modules/fabric-network/lib/gateway.js:287:3）在异步主目录（/home/fabric-samples/fabcar/javascript/query.js:33:25）无法评估事务：错误：无法初始化通道。尝试联系2个对等方。最后一个错误是错误：频道：mychannel发现错误：访问被拒绝在Channel._discover（/home/fabric-samples/fabcar/javascript/node_modules/fabric-client/lib/Channel.js:1272:11）在异步Channel._initialize（/home/fabric-samples/fabcar/javascript/node_modules/fabric-client/lib/Channel.js:291:32）在异步Channel.initialize（/home/fabric-samples/fabcar/javascript/node_modules/fabric-client/lib/Channel.js:244:14）在异步Network._initializeInternalChannel（/home/fabric-samples/fabcar/javascript/node_modules/fabric-network/lib/network.js:105:5）在异步Network._initialize（/home/fabric-samples/fabcar/javascript/node_modules/fabric-network/lib/network.js:130:3）在异步Gateway.getNetwork（/home/fabric-samples/fabcar/javascript/node_modules/fabric-network/lib/gateway.js:287:3）在异步主服务器上（/home/fabric-samples/fabcar/javascript/query.js:33:25）
尝试取出钱包，然后重新注册管理员和用户。在/ fabcar / javascript目录中：
rm -r ./wallet
node enrollAdmin.js
node registerUser.js
node query.js
如果不起作用，您可以尝试以下说明：https://hyperledger-fabric.readthedocs.io/en/release-1.4/write_first_app.html并停止网络（在/ first-network目录中）：
./byfn.sh down
docker rm -f $(docker ps -aq)
docker rmi -f $(docker images | grep fabcar | awk '{print $3}')