AWS lightsail ssh server problem "Server refused our key" & installing a website demo on pc -- 2

1- I can't connect the lightsail ssh by putty with the default ssh key "Server refused our key" 2- localhost demo website error - all xampp and other software are ready but can't start the "PHP artisan serve" and connect the database. Error msg During inheritance of ArrayAccess: Uncaught ErrorException: Return type of Illuminate\Support\Collection::offsetExists($key) should either be compatib le with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTyp eWillChange] attribute should be used to temporarily suppress the notice in G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Support\Colle [login to view URL] Stack trace: #0 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Support\Col [login to view URL](11): Illuminate\Foundation\Bootstrap\HandleExceptions->handleEr ror(8192, 'Return type of ...', 'G:\\My Drive\\web...', 1349) #1 G:\My Drive\web\Beta\vendor\composer\[login to view URL](478): include('G:\\ My Drive\\web...') #2 G:\My Drive\web\Beta\vendor\composer\[login to view URL](346): Composer\Auto load\includeFile('G:\\My Drive\\web...') #3 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Support\hel [login to view URL](110): Composer\Autoload\ClassLoader->loadClass('Illuminate\\Supp.. .') #4 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Foundation\ [login to view URL](89): collect(Array) #5 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Foundation\ [login to view URL](78): Illuminate\Foundation\PackageManifest->config('ali ases') #6 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Foundation\ Bootstrap\[login to view URL](26): Illuminate\Foundation\PackageManifest->a liases() #7 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Foundation\ [login to view URL](230): Illuminate\Foundation\Bootstrap\RegisterFacades->boot strap(Object(Illuminate\Foundation\Application)) #8 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Foundation\ Console\[login to view URL](310): Illuminate\Foundation\Application->bootstrapWith(A rray) #9 G:\My Drive\web\Beta\vendor\laravel\framework\src\Illuminate\Foundation\ Console\[login to view URL](127): Illuminate\Foundation\Console\Kernel->bootstrap() #10 G:\My Drive\web\Beta\artisan(37): Illuminate\Foundation\Console\Kernel- >handle(Object(Symfony\Component\Console\Input\ArgvInput), Object(Symfony\C omponent\Console\Output\ConsoleOutput)) #11 {main} You need to connect my computer to fix this problem with a chrome remote desktop.