PHP Fatal ERRAGE: Unbekundeter Fehler: Klasse 'Normalizer' nicht in /usr/share/php/symfony/component/console/helper/help ⇐ Php

[Guest]

Ich versuche, eine Komponistin in einem Laravel -Projekt zu installieren, das aus Git kloniert ist. < /p>
, aber ich bekomme einige Fehler. Eine, die ich gelöst habe, war: < /p>

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- phpunit/phpunit[8.5.0, ..., 8.5.x-dev] require ext-dom * -> it is missing from your system. Install or enable PHP's dom extension.

durch TEILE:

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sudo apt install php7-4-xml php7.4-mbstring

Aber jetzt, wenn ich einen Composer -Update oder Composer installiere Ich erhalte diese Antwort:

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PHP Fatal error:  Uncaught Error: Class 'Normalizer' not found in /usr/share/php/Symfony/Component/Console/Helper/Helper.php:129

.

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Stack trace:

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#0 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(516): Symfony\Component\Console\Helper\Helper::strlenWithoutDecoration()
#1 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(576): Symfony\Component\Console\Helper\ProgressBar::Symfony\Component\Console\Helper\{closure}()
#2 [internal function]: Symfony\Component\Console\Helper\ProgressBar->Symfony\Component\Console\Helper\{closure}()
#3 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(589): preg_replace_callback()
#4 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(414): Symfony\Component\Console\Helper\ProgressBar->buildLine()
#5 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(323): Symfony\Component\Console\Helper\ProgressBar->display()
#6 /usr/share/php/Composer/Util/Loop.php(85): Symfony\Component\Console\Helper\ProgressBar->start()
#7 /usr/share/php/Compos in /usr/share/php/Symfony/Component/Console/Helper/Helper.php on line 129

Fatal error: Uncaught Error: Class 'Normalizer' not found in /usr/share/php/Symfony/Component/Console/Helper/Helper.php:129
Stack trace:
#0 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(516): Symfony\Component\Console\Helper\Helper::strlenWithoutDecoration()
#1 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(576): Symfony\Component\Console\Helper\ProgressBar::Symfony\Component\Console\Helper\{closure}()
#2 [internal function]: Symfony\Component\Console\Helper\ProgressBar->Symfony\Component\Console\Helper\{closure}()
#3 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(589): preg_replace_callback()
#4 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(414): Symfony\Component\Console\Helper\ProgressBar->buildLine()
#5 /usr/share/php/Symfony/Component/Console/Helper/ProgressBar.php(323): Symfony\Component\Console\Helper\ProgressBar->display()
#6 /usr/share/php/Composer/Util/Loop.php(85): Symfony\Component\Console\Helper\ProgressBar->start()
#7 /usr/share/php/Compos in /usr/share/php/Symfony/Component/Console/Helper/Helper.php on line 129