Issue:
The site displays an HTTP 500 Error after some upates.

Diagnosis:
The error is from the index.php file and it reads:
PHP Parse error: syntax error, unexpected token "<", expecting end of file in /home2/base10/public_html/index.php on line 50

I see that this are the related codes and the last one is Line 50.
*requireonce JPATHBASE . '/includes/framework.php';

// Set profiler start time and memory usage and mark afterLoad in the profiler.
JDEBUG ? JProfiler::getInstance('Application')->setStart($startTime, $startMem)->mark('afterLoad') : null;

// Instantiate the application.
$app = JFactory::getApplication('site');

// Execute the application.
$app->execute();

</textarea>Result:OK</body></html*

Temporary fix:
I remarked out Line 50: #</textarea>Result:OK</body></html*

I need a permanent solution as I don't believe this is a real fix.