Error occurred in deployment step 'install app for sharepoint' the system account cannot perform this action.

I am trying to develop a Provider Hosted App in a High Trust On Premise SharePoint 2013 environment. I am logged into the VM as sp_farm account. I followed the steps provided in the following link.

https://msdn.microsoft.com/en-us/library/office/fp179901.aspx

But still, I got the error

Error occurred in deployment step 'install app for sharepoint'. The system account cannot perform this action.

When I searched it, I got the solution provided in the following links

http://www.enjoysharepoint.com/Articles/Details/error-occurred-in-deployment-step-install-app-for-sharepoint-the-20819.aspx

http://blog.aditi.com/enterprise_social/challenges-starting-developing-apps-sharepoint-2013/

Though I tried it, it doesn't seem to be working. Also, now I don't know, how to revert the certificate steps and Power shell steps back so that I can revert everything and retry. Any help would be highly appreciated.

Ven