Fatal error when using PHP8.0 with multisite

When using PHP7.3 in multisite, it works normally, but Fatal error occurs in PHP8.0.
Is this a theme bug?
Any solution?
The error is as follows.

Fatal error: Uncaught TypeError: ftp_fget(): Argument #1 ($ftp) must be of type resource, null given in /home/hogehoge/hogehoge/wp-admin/includes/class-wp-filesystem-ftpext.php:146 Stack trace: #0 /home/hogehoge/hogehoge/wp-admin/includes/class-wp-filesystem-ftpext.php(146): ftp_fget() #1 /home/hogehoge/hogehoge/wp-content/themes/Newspaper/includes/wp-booster/wp-admin/plugins/class-tagdiv-theme-plugins-setup.php(351): WP_Filesystem_FTPext->get_contents() #2 /home/hogehoge/hogehoge/wp-content/themes/Newspaper/includes/wp-booster/wp-admin/plugins/class-tgm-plugin-activation.php(1977): tagdiv_theme_plugins_setup->theme_plugin_has_update() #3 /home/hogehoge/hogehoge/wp-content/themes/Newspaper/includes/wp-booster/wp-admin/plugins/class-tgm-plugin-activation.php(1836): TGM_Plugin_Activation->does_plugin_have_update() #4 /home/hogehoge/hogehoge/wp-content/themes/Newspaper/includes/wp-booster/wp-admin/plugins/class-tgm-plugin-activation.php(422): TGM_Plugin_Activation->is_tgmpa_complete() #5 /home/hogehoge/hogehoge/wp-includes/class-wp-hook.php(308): TGM_Plugin_Activation->init() #6 /home/hogehoge/hogehoge/wp-includes/class-wp-hook.php(332): WP_Hook->apply_filters() #7 /home/hogehoge/hogehoge/wp-includes/plugin.php(517): WP_Hook->do_action() #8 /home/hogehoge/hogehoge/wp-settings.php(617): do_action() #9 /home/hogehoge/hogehoge/wp-config.php(105): require_once(‘…’) #10 /home/hogehoge/hogehoge/wp-load.php(50): require_once(‘…’) #11 /home/hogehoge/hogehoge/wp-admin/admin.php(34): require_once(‘…’) #12 /home/hogehoge/hogehoge/wp-admin/plugins.php(10): require_once(‘…’) #13 {main} thrown in /home/hogehoge/hogehoge/wp-admin/includes/class-wp-filesystem-ftpext.php on line 146

Hi.
Thank you for your prompt response.
The theme version is the latest 12.1.1.
I’m still having problems with the site, so I’m asking here.

Thank you.

Hi.

I deactivated all plugins except tagdiv as you instructed but the result is the same.
Anything else to try?

Thank you.

@Ryu234 I’m currently using Newspaper 12.1.1 and php8.1 without any issues.

Did you try another theme other than tagDiv to see if it’s a theme issue or a hosting config issue?

Hi.

I tried it.
It’s normal for other themes.
Also disabling just the tagDiv Composer works fine.
And I have the same server, same configuration, Newspaper theme on a single site and it works fine.

Thank you.

Hi

This issue is happening only with multisite.
I am using child theme.
If I am using a child theme, is there any workaround?

Hi

I tried using the main theme as you instructed, but I get the same error.
Is there any other workaround?

Hi.

There was a post saying that there is no problem using PHP8.1, so I will upgrade to PHP8.1 and try it.
I will report the results here at a later date.

Also, if you have any other workarounds, please let me know.

Thank you.