Joomla Administrator login page error

Question

This is in Joomla.Someone hacked mysite. I did ftp of all the files from the PC. Everything is working except the domain.com/administrator page. I am able to login to the Control Panel and use File Manager. Can I fix the domain.com/administrator page from the File Manager?

The error message is:

mark('afterLoad') : null; // Instantiate the application. 

$app = JFactory::getApplication('administrator'); // Initialise the application. 

$app->initialise(array( 'language' => $app->getUserState('application.lang') )); // Mark afterIntialise in the profiler. 

JDEBUG ? $_PROFILER->mark('afterInitialise') : null; // Route the application. 

$app->route(); // Mark afterRoute in the profiler. 

JDEBUG ? $_PROFILER->mark('afterRoute') : null; // Dispatch the application. 

$app->dispatch(); // Mark afterDispatch in the profiler. 

JDEBUG ? $_PROFILER->mark('afterDispatch') : null; // Render the application. 

$app->render(); // Mark afterRender in the profiler.

JDEBUG ? $_PROFILER->mark('afterRender') : null; // Return the response.

echo $app;