When creating my account, i created an admin email (admin@mywebsite), to be accessed through typing my gmail as the id, and want to change that,

I created an admin@mywebsite.com email, and then added another alias to it, so that i can change the login info of the admin to become admin@mywebsite rather than my gmail.

When i try to delete the admin@mywebsite alias from that account, i get 

DHE101:Internal Error occurs

How can I fix that?

thanks