Fatal error: Uncaught Error: Class "Spatie\Backtrace\Tests\TestCase" not found in C:\xampp\htdocs\r10ca\vendor\spatie\backtrace\tests\BacktraceTest.php:14 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\spatie\backtrace\tests\BacktraceTest.php on line 14