Problem: I cannot login to the site.
Solution:
The blank page means (or “500 error”) that there is an error in the PHP code that your site runs. When errors are not caught, the server stops everything and returns a page that says “500 error” or an empty page. Different servers are configured to display these errors slightly differently, but they all mean the same – there is an unhandled PHP error in the site’s code.
First, you need to see what the errors are. Guessing what might be the problem and trying different solutions may lead to even more trouble. The first step is to enable debugging. You can add a few lines to the site’s wp-config.php file. With the error log enabled, you will see the actual problem.
To enable it, open your wp-config.php file and look for define('WP_DEBUG', false);. Change it to:
define('WP_DEBUG', true);
To enable the error logging to a file on the server, you need to add yet one more similar line:
define( 'WP_DEBUG_LOG', true );
The errors will be saved to a debug.log file inside the /wp-content/directory.
https://wpml.org/documentation/support/debugging-wpml/
Let me know what you see after the debug mode has been enabled.
