Error: 'environment' when iotedgehubdev start -d

[czgtest]

step:

1. For the edge hub set an environment variable OptimizeForPerformance to false in the deployment manifest:

"edgeHub": {
"type": "docker",
"status": "running",
"restartPolicy": "always",
"settings": {
"image": "mcr.microsoft.com/azureiotedge-hub:1.0",
"createOptions": "{"HostConfig":{"PortBindings":{"5671/tcp":[{"HostPort":"5671"}], "8883/tcp":[{"HostPort":"8883"}],"443/tcp":[{"HostPort":"443"}]}}}"
},
"env": {
"OptimizeForPerformance": {
"value": "false"
}
}
}

2. run iotedgehubdev start -d deployment.json
   ERROR: Error: 'environment'