Fatal error: Uncaught Error: Class "SebastianBergmann\Comparator\ObjectComparator" not found in C:\mywamp\sites\allsite\calcomposer\vendor\sebastian\comparator\tests\_files\TestClassComparator.php:13 Stack trace: #0 {main} thrown in C:\mywamp\sites\allsite\calcomposer\vendor\sebastian\comparator\tests\_files\TestClassComparator.php on line 13