Page not Loading

Hello,

I am using this plugin for a few months. But after I changed to a better host and took SSL, it is giving errors, like a painfully slow website or some pages do not load, it just shows loading but never loads. I am using the plugin Wp Touch Mobile for the different interface in mobile. There was no issue whatsoever until now. It is a good plugin, used to make my website really fast. But please fix this issue so I can use it again.
Website: https://shepherdtraveller.com

Here is a message that I received from my host
[23-Mar-2020 08:35:59 UTC] PHP Warning: include_once(/home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/core/modules/class-page-cache.php): failed to open stream: No such file or directory in /home4/shephfe6/public_html/wp-content/advanced-cache.php on line 28
[23-Mar-2020 08:35:59 UTC] PHP Warning: include_once(): Failed opening ‘/home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/core/modules/class-page-cache.php’ for inclusion (include_path=’.:/opt/cpanel/ea-php73/root/usr/share/pear’) in /home4/shephfe6/public_html/wp-content/advanced-cache.php on line 28

And this I received from WordPress
Since WordPress 5.2 there is a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email.
In this case, WordPress caught an error with one of your plugins, Hummingbird.
When seeking help with this issue, you may be asked for some of the following information:
WordPress version 5.3.2
Current theme: Sydney (version 1.60)
Current plugin: Hummingbird (version 2.4.1)
PHP version 7.3.13

An error of type E_ERROR was caused in line 84 of the file /home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/core/class-core.php. Error message: Uncaught Error: Class ‘Hummingbird\Core\Integration\WPH’ not found in /home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/core/class-core.php:84
Stack trace:
#0 /home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/core/class-core.php(48): Hummingbird\Core\Core->init_integrations()
#1 /home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/wp-hummingbird.php(135): Hummingbird\Core\Core->__construct()
#2 /home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/wp-hummingbird.php(124): Hummingbird\WP_Hummingbird->init()
#3 /home4/shephfe6/public_html/wp-content/plugins/hummingbird-performance/wp-hummingbird.php(110): Hummingbird\WP_Hummingbird->__construct()
#4 /home4/shephfe6/public_html/wp-includes/class-wp-hook.php(288): Hummingbird\WP_Hummingbird::get_instance(”)
#5 /home4/shephfe6/public_html/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(NULL, Array)
#6 /home4/shephfe6/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(

Further I tried to make it work by switching back to PHP version 7.2 but it was no use. Please help me with this issue.