嵌套的ARM模板的段长度不正确

Question

我收到“在行'1'和列'181'处类型'Microsoft.Network/virtualNetworks/subnets'的模板资源'testing'具有不正确的段长度。”尝试部署我的ARM模板时出现错误消息。任何想法可能有什么问题吗？

{
  "apiVersion": "2017-08-01",
  "name": "nestedTemplate",
  "type": "Microsoft.Resources/deployments",
  "resourceGroup" : "[variables('ResourceGroupName')]",
  "dependsOn": [
    "[resourceId('Microsoft.Network/networkSecurityGroups', variables('NSGName'))]"
  ],
  "properties": {
    "mode" : "Incremental",
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
      "contentVersion": "1.0.0.0",
      "resources": [
        {
          "apiVersion" : "2018-03-01",
          "type": "Microsoft.Network/virtualNetworks/subnets",
          "name": "[parameters('subnetName')]",
          "location": "[resourceGroup().location]",
          "properties": {
            "addressPrefix": "[reference(resourceId(variables('ResourceGroupName'), 'Microsoft.Network/virtualNetworks/subnets', parameters('virtualNetworkName'), parameters('subnetName')), '2018-03-01').addressPrefix]",
            "networkSecurityGroup": {
              "id": "[resourceId('Microsoft.Network/networkSecurityGroups', variables('NSGName'))]"
            }
          }
        },
      ]
    }
  }
}