By looking at the debug info that you have attached, I can see that your server WP Memory Limit is set to 40M.
Our recommendations are to have the following as minimal requirements:
- PHP 5.6 and above (this OK with your installation) with a WP Memory Limit of at least 128MB and more if possible.
- MySQL 5.6 and above.
Please follow this link for detailed documentation: https://wpml.org/home/minimum-requirements/
Is it possible for you to change those to the minimum requirement?
You may need to contact your hosting provider for that.
Meeting those baseline requirements is most critical before starting to debug and sometimes solves issues like you experiencing.
Most important is to raise the WP Memory Limit.
Please try to raise it before you contact your hosting company.
You can try and do it from the wp-config.php file in your WordPress installation.
Insert this code in that file.