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I got given a Craft CMS project build with composer and npm. Pointed valet to the correct folder, installed all the dependencies and started the app with npm run watch.

http://localhost:3000 just gives me an "Internal Server Error" though...

Craft CMS Internal Server Error

There is nothing in the logs apart from sth inside storage/logs/web.log which does not sound like a showstopper:

2020-12-07 06:59:06 [-][-][-][error][yii\base\ErrorException:8192] yii\base\ErrorException: Method ReflectionParameter::isArray() is deprecated in /vendor/yiisoft/yii2/web/Controller.php:133 Stack trace:

Error 500 bugs are really hard to track down, any hints would be appreciated!

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Based on the error message and this: https://php.watch/versions/8.0/deprecated-reflectionparameter-methods, it sounds like you're running PHP 8, which Craft isn't compatible with, yet.

The soon-to-be-released Craft 3.6 adds PHP 8 compatibility, so you'll want to downgrade to PHP 7.4 until that's out.

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  • thank you so much for the hint with the PHP versions, downgrading to PHP 7.4 was the solution :)
    – nerdess
    Dec 8, 2020 at 7:19

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