Windows Azure–Object reference not set to an Instance

I was doing R&D using Windows Azure PowerShell. I used Azure one month Trail account because of heavy usage, the amount $200 has totally out, normally for free account we will get $200 amount of usage for one month. It was not sufficient for me so i created one more trail account.
Scenario: I was worked on HDInsight MapReduce Jobs, i got perfect result while using first trial account. Afterwards, once i created a new account again i pointed the connection to new account and run the same MapReduce jobs but it got failed. I tried many times, spent around 2 to 3 hours for this. The error which i received is “object reference not set to an instance”. Please check the below error screenshot.
Azure_PowerShell
I found that something went wrong while using the second trail account. I just tried to clear the powershell environment but it was not worked then i reinstall the azure power shell again it was helpless.
Finally i checked the powershell, how many accounts pointed with. It has shown two accounts and checked the subscriptions also. Then i removed the old subscription. Now i have one account which is pointed with Azure power shell.
Codes used in PowerShell
-----Check the Available Accounts
> Get-AzureAccount
>Get-AzureSubscription
----Remove the unwanted accounts
>Remove-AzureSubscription
I got it, Now my MapReduce jobs are working.

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