Error: "Unable to deploy network #### because the network quota for this Organization VDC has been reached." when starting VMs in VMware Cloud Director

Products

• VMware Cloud Director

Issue/Introduction

• Starting the vApp/VM(s) in VMware Cloud Director(VCD) fails with the error:
  
  Unable to deploy network ##### because the network quota for this Organization VDC has been reached.
  
  
• The browser logs doesn't show any error. 
• In the /opt/vmware/vcloud-director/logs/vcloud-container-debug.log log, the lines of the following form are seen:
  
  DeployVAppVmSubsetActivity     | [Activity Execution] Uncaught Exception during Activity execution. Recent phase: com.vmware.ssdc.backend.DeployVAppVmSubsetActivity$DeployNetworksPhase...
java.util.concurrent.ExecutionException: com.vmware.vcloud.api.presentation.service.OperationLimitsExceededException: Unable to deploy network ###### because the network quota for this Organization VDC has been reached.
        at com.vmware.vcloud.activity.executors.ActivityRunner.run(ActivityRunner.java:136)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
        at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.vmware.vcloud.api.presentation.service.OperationLimitsExceededException: Unable to deploy network ##### because the network quota for this Organization VDC has been reached.
        at com.vmware.vcloud.networking.model.vappnetwork.ModelBasedVAppNetworkManager.validateOrgVdcHasEnoughSpaceInNetworkQuota(ModelBasedVAppNetworkManager.java:152)
        at com.vmware.vcloud.networking.model.vappnetwork.ModelBasedVAppNetworkManager.deployVappNetworks(ModelBasedVAppNetworkManager.java:138)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

Environment

VMware Cloud Director 10.x

Cause

This issue occurs when the Network Pool quota reached its limit thereby causing the network deployments to fail as part of the vApp/VM power operations. 

Resolution

To resolve the issue,

1. Increase the network pool quota as per the step 4(c) in https://docs.vmware.com/en/VMware-Cloud-Director/10.5/VMware-Cloud-Director-Service-Provider-Admin-Guide/GUID-83D6D86E-712A-4731-ABA3-4E8BBC6370CD.html 
2. Start the vApp/VM again