Fatal error: Uncaught Error: Class "SebastianBergmann\Comparator\ObjectComparator" not found in C:\AppServ\Apache\2.4.66\htdocs\sets\vendor\sebastian\comparator\src\MockObjectComparator.php:17 Stack trace: #0 {main} thrown in C:\AppServ\Apache\2.4.66\htdocs\sets\vendor\sebastian\comparator\src\MockObjectComparator.php on line 17