Laravel Dusk show this error in every project:
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1Welcome to Ask Ubuntu Please edit your question including the output errors as text editor instead as image? – abu-ahmed al-khatiri Dec 05 '18 at 11:50
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this is the output after install laravel dusk when we use the php artisan dusk command it shows this error. – Dec 05 '18 at 11:54
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1I reverted your question to the state which was answered by kukulo. If this answer solved your problem, you can accept accept it (✓). For a new problem, you should start a new question instead of completely replacing the previous one with new contents. Note that your follow-up question is a programming question and should go to [so] (with error as text and the relevant code). – Melebius Dec 05 '18 at 13:15
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Your connection at port 9515 is refused.
Potential failures:
1 - Firewall is blocking the connection (use nmap to see if port is open)
2 - No application is running on port 9515 (use netstat to check it)

kukulo
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After that it shows this error : TypeError: Argument 1 passed to Facebook\WebDriver\Remote\DesiredCapabilities::__construct() must be of the type array, null given, – Dec 05 '18 at 12:02
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Whatewer is calling Facebook\WebDriver\Remote\DesiredCapabilities, is calling without arguments. An array is expected as argument. Check your php script that is calling it. – kukulo Dec 05 '18 at 12:07