Re: Bug: An Error after Click the Activation Link in Email
Don’t use @r-a-y codes
@mikey3d – Is that a general recommendation? 
I did say it was test code. Looks like you have whitespace issues in your /registration/activate.php. Delete any trailing whitespace from the beginning of that file.
eg.
` -spaces – <?php` – Delete that trailing space!
Your htaccess rewrite rules look like it will interfere with querystring variables.
eg. example.com/my-page/?variable=my-test
