Checkout-(Failure)-Process.php

[alyss]

I would really appreciate if someone could give me any ideas about this one...
REALLY REALLY APPRECIATE IT!

When on my swedish site people can get to the very last step of checkout, but then an error comes up on a blank page:

Fatal error: Call to undefined function: tep_currency_format() in /home2/hygrowc/public_html/webshop/includes/languages/svenska/checkout_process.php on line 27

My svenska/checkout_process.php it looks like this on line 27....

order_id=' . $insert_id . "\n" . EMAIL_TEXT_DATE_ORDERED . ' ' . $date_formatted . "\n\n";

When I try to make changes to this line I get other errors, saying that the url is already defined in includes/functions/general.php...

I do not have ssl, and i have the old OSC model. The only mods I have made are to the shipping account details and ways of shipping - but no permanant mods to this file at all.

I am so desperate that I have even tried putting other language checkout_process.php's into this file, but that seems to make more problems! lol.

Please if anyone spots an obvious error or can at least point me in the right direction, please help!?!!

Thanks, Alyssa