I was going to asked same question.
I have same error message such as"
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /virtual/users/e16666-18007/web/emails2.php:1) in /virtual/users/e16666-18007/web/WA_ValidationToolkit/WAVT_ValidatedForm_PHP.php on line 3"
and I look for the space error but couldn't find it.
I attached the page, Please see if you could find the error.
thanks for reading and help