ErrorException - Trying to access array offset on value of type null in ServiceProvider.php line 84 in Lumen

I am new to Lumen so I just downloaded and installed a fresh lumen setup but unfortunately as soon as I hit postman it sends me above error. I have read many posts all says to use isset() i did so but still error persists therefore i request to help me. Composer update also does not work.

Thanks!

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