I already pasted the purchase code but getting errors at activation of the theme

Hi,
I purchased hte theme through ThemeForest but after activation,i am still getting these errors:

Last time we checked the token we were not able to connected to Envato:

Purchases could not be accessed
Username could not be accessed (needed for your information only)
E-Mail could not be accessed (needed for your information only)
Following errors occurred:

Purchases: Your private token is invalid.
username Your private token is invalid.
email Your private token is invalid.
Purchases: A problem occurred accessing your purchases. Unable to check for updates.

Where can i get the private token?