PHP, Composer paket kurarken hata alıyorum.

Using version ^1.4 for jenssegers/blade
./composer.json has been updated
Running composer update jenssegers/blade --with-dependencies
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - illuminate/support[v5.5.0, ..., v5.8.36, v6.0.0, ..., v6.20.8, v7.0.0, ..., v7.30.1, v8.0.0, ..., v8.20.1] require ext-mbstring * -> it is missing from your system. Install or enable PHP's mbstring extension.
    - jenssegers/blade v1.4.0 requires illuminate/view ^5.5|^6.0|^7.0|^8.0 -> satisfiable by illuminate/view[v5.5.0, ..., v5.8.36, v6.0.0, ..., v6.20.8, v7.0.0, ..., v7.30.1, v8.0.0, ..., v8.20.1].
    - illuminate/view[v5.5.0, ..., v5.5.44] require illuminate/support 5.5.* -> satisfiable by illuminate/support[v5.5.0, ..., v5.5.44].
    - illuminate/view[v5.6.0, ..., v5.6.39] require illuminate/support 5.6.* -> satisfiable by illuminate/support[v5.6.0, ..., v5.6.39].
    - illuminate/view[v5.7.0, ..., v5.7.28] require illuminate/support 5.7.* -> satisfiable by illuminate/support[v5.7.0, ..., v5.7.28].
    - illuminate/view[v5.8.0, ..., v5.8.36] require illuminate/support 5.8.* -> satisfiable by illuminate/support[v5.8.0, ..., v5.8.36].
    - illuminate/view[v6.0.0, ..., v6.20.8] require illuminate/support ^6.0 -> satisfiable by illuminate/support[v6.0.0, ..., v6.20.8].
    - illuminate/view[v7.0.0, ..., v7.30.1] require illuminate/support ^7.0 -> satisfiable by illuminate/support[v7.0.0, ..., v7.30.1].
    - illuminate/view[v8.0.0, ..., v8.20.1] require illuminate/support ^8.0 -> satisfiable by illuminate/support[v8.0.0, ..., v8.20.1].
    - Root composer.json requires jenssegers/blade ^1.4 -> satisfiable by jenssegers/blade[v1.4.0].

To enable extensions, verify that they are enabled in your .ini files:
    - /etc/php/7.4/cli/php.ini
    - /etc/php/7.4/cli/conf.d/10-opcache.ini
    - /etc/php/7.4/cli/conf.d/10-pdo.ini
    - /etc/php/7.4/cli/conf.d/20-calendar.ini
    - /etc/php/7.4/cli/conf.d/20-ctype.ini
    - /etc/php/7.4/cli/conf.d/20-exif.ini
    - /etc/php/7.4/cli/conf.d/20-ffi.ini
    - /etc/php/7.4/cli/conf.d/20-fileinfo.ini
    - /etc/php/7.4/cli/conf.d/20-ftp.ini
    - /etc/php/7.4/cli/conf.d/20-gettext.ini
    - /etc/php/7.4/cli/conf.d/20-iconv.ini
    - /etc/php/7.4/cli/conf.d/20-json.ini
    - /etc/php/7.4/cli/conf.d/20-phar.ini
    - /etc/php/7.4/cli/conf.d/20-posix.ini
    - /etc/php/7.4/cli/conf.d/20-readline.ini
    - /etc/php/7.4/cli/conf.d/20-shmop.ini
    - /etc/php/7.4/cli/conf.d/20-sockets.ini
    - /etc/php/7.4/cli/conf.d/20-sysvmsg.ini
    - /etc/php/7.4/cli/conf.d/20-sysvsem.ini
    - /etc/php/7.4/cli/conf.d/20-sysvshm.ini
    - /etc/php/7.4/cli/conf.d/20-tokenizer.ini
You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.

Installation failed, reverting ./composer.json and ./composer.lock to their original content.