Error updating to PS 1.5.6

[moy2010]

My store was on PS 1.4.8.2, and I updated it to PS 1.5.6 using the module 1-click-upgrade. Everything went ok and it said that the update was succesful. 

 

After this I refreshed the webpage to access the B.O., and all I got was a blank page. I activated the display errors option in the defines.inc.php file and I got this:

 

Warning: Invalid argument supplied for foreach() in /home2/xxx/public_html/classes/Language.php on line 670

Warning: Cannot modify header information - headers already sent by (output started at /home2/pcexpert/public_html/classes/Language.php:670) in /home2/xxx/public_html/admin1/index.php on line 39

Warning: Invalid argument supplied for foreach() in /home2/xxx/public_html/classes/Language.php on line 670

Warning: Cannot modify header information - headers already sent by (output started at /home2/pcexpert/public_html/classes/Language.php:670) in /home2/xxx/public_html/classes/Cookie.php on line 327

Warning: Invalid argument supplied for foreach() in /home2/xxx/public_html/classes/Language.php on line 670

Warning: Cannot modify header information - headers already sent by (output started at /home2/pcexpert/public_html/classes/Language.php:670) in /home2/xxx/public_html/classes/Tools.php on line 141

 

I've already tried to overwrite the mentioned files, but the error persists :S.

[NemoPS]

For some reason, the language query returns nothing (so it seems)

 

$sql = 'SELECT l.*, ls.`id_shop`

FROM `'._DB_PREFIX_.'lang` l

LEFT JOIN `'._DB_PREFIX_.'lang_shop` ls ON (l.id_lang = ls.id_lang)';

 

Can you check the ps_lang and ps_lang_shop tables? Can you maybe screen them?