Blank Screen when emailing invoice and no mail arrive on my email

I would like to ask some help on how to fix the bugs. I want to send an email but it goes to blank page and i cant receive any email. Also when i generate pdf it wont generate too. Thanks!

Which version are you using?
I had the same issues with 1.4.3 zip, there is a syntax error in it.

Or you’re missing a module.
If you enable errors, by putting

php_flag display_errors on

In your .htaccess file, you should see the error, so we can help you