jos-Error: Application Instantiation Error

JFactory :: getApplication() @ C:\Inetpub\webpages\chairs\philology\index.php:28
JApplication :: getInstance() @ C:\alljoomla\173\libraries\joomla\factory.php:102
JSite -> __construct() @ C:\alljoomla\173\libraries\joomla\application\application.php:208
JApplication -> __construct() @ C:\alljoomla\173\includes\application.php:47
JApplication -> _createSession() @ C:\alljoomla\173\libraries\joomla\application\application.php:173
JFactory :: getSession() @ C:\alljoomla\173\libraries\joomla\application\application.php:1046
JFactory :: createSession() @ C:\alljoomla\173\libraries\joomla\factory.php:152
JSession :: getInstance() @ C:\alljoomla\173\libraries\joomla\factory.php:661
JSession -> __construct() @ C:\alljoomla\173\libraries\joomla\session\session.php:152
JSession -> _start() @ C:\alljoomla\173\libraries\joomla\session\session.php:115
session_start() @ C:\alljoomla\173\libraries\joomla\session\session.php:531
JSessionStorageDatabase -> read()
JFactory :: getDbo() @ C:\alljoomla\173\libraries\joomla\session\storage\database.php:67
JFactory :: createDbo() @ C:\alljoomla\173\libraries\joomla\factory.php:308
JDatabase :: getInstance() @ C:\alljoomla\173\libraries\joomla\factory.php:710
JDatabaseMySQLi -> __construct() @ C:\alljoomla\173\libraries\joomla\database\database.php:323
JText :: _() @ C:\alljoomla\173\libraries\joomla\database\database\mysqli.php:110
JFactory :: getLanguage() @ C:\alljoomla\173\libraries\joomla\methods.php:133
JFactory :: createLanguage() @ C:\alljoomla\173\libraries\joomla\factory.php:172
JLanguage :: getInstance() @ C:\alljoomla\173\libraries\joomla\factory.php:823
JLanguage -> __construct() @ C:\alljoomla\173\libraries\joomla\language\language.php:270
JLanguage -> setLanguage() @ C:\alljoomla\173\libraries\joomla\language\language.php:174
JLanguage :: getMetadata() @ C:\alljoomla\173\libraries\joomla\language\language.php:1231
JLanguage :: parseXMLLanguageFile() @ C:\alljoomla\173\libraries\joomla\language\language.php:1171
JFactory :: getXML() @ C:\alljoomla\173\libraries\joomla\language\language.php:1402
JError :: raiseWarning() @ C:\alljoomla\173\libraries\joomla\factory.php:455
JError :: raise() @ C:\alljoomla\173\libraries\joomla\error\error.php:276
JError :: throwError() @ C:\alljoomla\173\libraries\joomla\error\error.php:176
call_user_func_array() @ C:\alljoomla\173\libraries\joomla\error\error.php:214
JError :: handleMessage()
JFactory :: getApplication() @ C:\alljoomla\173\libraries\joomla\error\error.php:705
JError :: raiseError() @ C:\alljoomla\173\libraries\joomla\factory.php:99
JError :: raise() @ C:\alljoomla\173\libraries\joomla\error\error.php:251