Fatal error: Uncaught Error: Class "Carbon\CarbonImmutable" not found in C:\xampp\htdocs\r10ca\vendor\nesbot\carbon\tests\CarbonImmutable\Fixtures\BadIsoCarbon.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\nesbot\carbon\tests\CarbonImmutable\Fixtures\BadIsoCarbon.php on line 18