T0M75

Yes almost no php errors, (except when deleting this plugin):
Non-static method WpFastestCache::uninstall() should not be called statically
Type: PHP Deprecated Line: 286
File: /var/www/html/wp-includes/class-wp-hook.php

Thanks great support.

This zip file gives next errors:
Accessing setup page
Trying to get property ‘wpFastestCacheLanguage’ of non-object
Type: PHP Notice Line: 1631
File: /var/www/html/wp-content/plugins/wp-fastest-cache/inc/admin.php

Deleting the plugin
Non-static method WpFastestCache::uninstall() should not be called statically
Type: PHP Deprecated Line: 286
File: /var/www/html/wp-includes/class-wp-hook.php

Thanks a lot! Can you guess if there might be any drawbacks by doing so?

My questions are:
Is there any reason why variables should be passed by reference?
What are the considerations to insist it?

I do not want to find the source of error i know where it is. I want to know, if there is any good reason why the developer of current plugin might make such assumption? Is there any security considerations involved or might it cause other future errors?

The theme i am using is Hueman and the developer has instructions how to create child theme, but why can’t I use Child Theme Configurator. I am interested of reasons behind the problem nothing else in fear of future. When i choose to use named theme.

Full error message:
Notice: Only variables should be passed by reference in hueman/option-tree/ot-loader.php on line 98
Notice: Only variables should be passed by reference in hueman/option-tree/ot-loader.php on line 326

I am sorry it is first time for me to write in forum.
I thought picture of vine tendrils or Orchidaceae both sides of the sidebar.
For examle picture in 90 degrees rotated