Help, error class_core.php on line 417

[thienhi228]

The bug seems to be like has been correct, but my error new when accessing forum:

Fatal error: The requested language does not exist, reset via tools.php. in [path]\includes\functions.php on line 1905

functions.php

1903 if (!isset($vbphrase) AND $user['lang_options'] === null)
1904 {
1905 trigger_error('The requested language does not exist, reset via tools.php.', E_USER_ERROR);
1906 }
1907
1908 $user['languageid'] = (!empty($languageid) ? $languageid : $user['languageid']);

I am used tools.php import Language defaults and setting up [Default Language]-English but still was this error.
Help me, please!