Unable to remove the VDI from the catalog with error:"The provisioning task already running on the Machine Catalog"

To resolve this issue, you will need to run the below powershell commands on your delivery controller: 

asnp Citrix*
(this command will load all Citrix powershell modules). 

Get-ProvTask -active $true
This command will gets the task history for the Machine Creation Service that are currently running tasks.
Take note of the Task ID filed that gets returned when running this command. 

Stop-provtask -TaskId xxxxxxx
This command stops currently running Machine Creation Service tasks.
You will need to take the task ID output got from the previous command. 

Remove-provtask -TaskId xxxxxxx
This command removes the specified task from the database for the Machine Creation Service

Once the above has been completed, login to the studio console and repeat the machine removal from catalog.
You should now be able to delete the VDI from the machine catalog. 

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Problem Cause

Stuck ProvTask

prov task is stuck during the machine removal from catalog