Fatal error: Uncaught Error: Class 'craft\db\Migration' not found in /home/luxurytr/public_html/lt8/vendor/putyourlightson/craft-blitz/src/migrations/m180628_120000_add_elementcaches_table.php:9 Stack trace: #0 {main} thrown in /home/luxurytr/public_html/lt8/vendor/putyourlightson/craft-blitz/src/migrations/m180628_120000_add_elementcaches_table.php on line 9