Fatal error: Uncaught Error: Class "SebastianBergmann\Diff\LongestCommonSubsequenceTestCase" not found in C:\xampp\htdocs\r10ca\vendor\sebastian\diff\tests\TimeEfficientImplementationTest.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\r10ca\vendor\sebastian\diff\tests\TimeEfficientImplementationTest.php on line 15