Fatal error: Uncaught Error: Class "Doctrine\Common\Lexer\AbstractLexer" not found in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/doctrine/lexer/tests/Doctrine/Common/Lexer/ConcreteLexer.php:7 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/myhospitalnow/mhn-hospital-ms/vendorback/doctrine/lexer/tests/Doctrine/Common/Lexer/ConcreteLexer.php on line 7