自己从头纯手动搭fabric：生成cert、key，创建genesis.block channel.tx anchor.tx；用sdk建通道及以后以后的工作
在sdk创建应用通道时报错
查orderer节点的log
"the identity is a member of a different MSP(expected OrdererMSP, got Org1MSP)"
Evaluation Failed: Only 0 policies were satisfied, but needed 1 of [ OrdererOrg.Writers]
Evaluation Failed: Only 0 policies were satisfied, but needed 1 of [ Orderer.Writers Consortiums.Writers]开始以为我的证书路径错了，或者policies设置错了
但是！结果是：
在用configtxgen create genesis.block和【channel.tx anchor.tx 】时都要参数 -channelID， 但是值应该是不一样的。
genesis.block用的是系统通道ID“syschan”，其余几个是应用通道ID"mychnnel"
这样重新生成创世块，并更新docker-compose.yaml中相应位置，重启即可