If you are facing this error Method Illuminate\Database\Schema\Blueprint::big does not exist. in your laravel project, you need to check which version you are running in your laravel. if the laravel version is 7.x or above you can use id() to generate auto increment id and if you are facing this issue in your child table just use cache comment php artisan config:cache
Still you face this issue just reopen your editor and check and run migration command again .
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