verification emails sent to the users doesn't contain text body... it send a file name no name and when its is downloaded there is no way to open that file...
no way to confirm email address for user...
How to solve this problem..
Sounds like you have an issue in the languages section. The verification email templates may be empty, or missing. I've attached a screenshot of what mine looks like. Go to admin / settings / languages. Type verification in the search box. It should be the first two listed under the "Base" section.