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Which theme are you using?

avenue from web2feel

That’s not a theme that’s supported here, only themes downloaded from the WordPress repo are.

That said, you should back out your changes (obviously ?? ) and then create a child theme of that Avenue theme.

https://codex.www.ads-software.com/Child_Themes

Activate that child theme and try your modifications on that child theme instead. It’s safer that way.

Whatever you do, do not copy the parent theme’s functions.php file into the child theme directory. That just won’t work. Whatever changes you wanted to make usually they can be made by editing copies of the theme files such as header.php or footer.php.

For more specific help then consider contacting the theme author.

https://www.web2feel.com/contact-me/

thanks for helping me. i will try to do this way.