Fatal error: Uncaught Error: Class "Drupal\KernelTests\KernelTestBase" not found in /home/yrdsb11w3creativ/public_html/YRDSB-Zips/D9/profiles/contrib/lightning/tests/src/Kernel/ComponentDiscoveryTest.php:14
Stack trace:
#0 {main}
thrown in /home/yrdsb11w3creativ/public_html/YRDSB-Zips/D9/profiles/contrib/lightning/tests/src/Kernel/ComponentDiscoveryTest.php on line 14