My site shows an error after changing the server

My site shows an error after changing the server

Only WordPress panel is available

The only difference is the previous and current servers
mod_ruid2 does not install on CentOS 8

My previous server was CentOS 7

Current and new server CentOS 8 :

debugging in WordPress :

Notice: The register_sidebar function was invoked incorrectly. No id has been set in the array arguments for the “bar 1” sidebar. Default to “sidebar-1”. Set the id manually to “sidebar-1” to turn off this alert and save the current content of the sidebar. For more information, please see Debugging in WordPress. (This message has been added to version 4.2.0.) In /home/admin/domains/japanmusik.ir/public_html/wp-includes/functions.php on line 5167

Notice: Undefined variable: output in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 241

Notice: Undefined variable: fix_tag in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 242

Notice: Undefined variable: showdot in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 243

Notice: Undefined variable: more_tags in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 246

Notice: Undefined variable: more_tags in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 249

Notice: Undefined variable: more_tags in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 252

Notice: Undefined variable: post in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 261

Notice: Trying to get property ‘ID’ of non-object in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 261

Notice: Undefined variable: post in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 261

Notice: Trying to get property ‘ID’ of non-object in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 261

Notice: Undefined variable: mlink_title in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/functions.php on line 261

Warning: Parameter 2 to wp_hide_post_Public :: query_posts_join () expected to be a reference, value given in /home/admin/domains/japanmusik.ir/public_html/wp-includes/class-wp-hook.php on line 287

Parse error: syntax error, unexpected end of file in /home/admin/domains/japanmusik.ir/public_html/wp-content/themes/6c/single.php on line 117
An important error has occurred on your website.

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