Error 500 represents a site core issue. Please try again later.
If that is your website, this code can mean either .htaccess or PHP syntax error.
Application Error 500 means a .htaccess misconfiguration. Please make sure the directives from that file are all written correctly.
Blank page Error 500 (returned only in code with no GUI response) means a PHP syntax error. Please go to 000webhost members area > Manage Website > Settings > General > Show errors > Off > On. This will instruct PHP core to display any errors/notices in your script. After doing so, please browse your website again and correct the errors from your PHP script.