Changed language - Now cannot log-in anymore!! HELP!!

I have made modifications to the language settings in the System-->Store setting page. When attempting to save modifications, system crashed and got

"Notice: Error: Could not load language italiano! in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/library/language.php on line 39Warning: Cannot modify header information - headers already sent by (output started at /home/teamteam12/public_html/rocktapeitalia.com/shop/admin/index.php:81) in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/library/currency.php on line 45Warning: Cannot modify header information - headers already sent by (output started at /home/teamteam12/public_html/rocktapeitalia.com/shop/admin/index.php:81) in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/engine/controller.php on line 28Warning: Cannot modify header information - headers already sent by (output started at /home/teamteam12/public_html/rocktapeitalia.com/shop/admin/index.php:81) in /home/teamteam12/public_html/rocktapeitalia.com/shop/system/engine/controller.php on line 29"

I am trying to log back in to revert changes but, once admin credentials are entered and confirmed to access, the same notice appears and won't let me do anything else. How do I get back into the store settings to revert everything back to work? Please help!!

Version, theme? You have 1.5.6.0 and simpleone.

What exactly did you change when you "made modifications"?

If you have a database backup, then send it back up to the database server (use phpMyAdmin but only if the backup came from phpMyAdmin). If not, go into host control panel's phpMyAdmin and find what pertains to store and then to language. You will stumble onto something that will clang a bell. There will be a number to change back to 0 or 1. Before you change that number use phpMyAdmin Export to bag a database backup.

Thanks! I think I changed what they call the store language and the system language.

Probably system language was the one that got you. In phpMyAdmin check the store table for both, but change the field number for system language first and retry before also changing the field number for store language. It may well be that the particular language pack has a problem and should be reopened in a pure ascii text editor and simply resaved with NO "BOM". See http://forum.opencart.com/viewtopic.php?f=161&t=117249 for some ideas.