Error: Class "Doctrine\Common\Lexer\AbstractLexer" not found

There should be a file at vendor/doctrine/lexer/lib/Doctrine/Common/Lexer/AbstractLexer.php, which Composer should have installed for you.

You can try deleting the entire vendor directory and rerunning composer install, which should redownload all packages.

Hi@longwave, Thank you very much for your comment, When I did that then I running Drush command please see below:

drush cr

Fatal error: Uncaught Exception: Could not locate autoload.php. cwd is /home/ide/project; __DIR__ is /home/ide/project/vendor/drush/drush in /home/ide/project/vendor/drush/drush/drush.php:58
Stack trace:
#0 /home/ide/project/vendor/drush/drush/includes/preflight.inc(18): require()
#1 phar:///usr/local/bin/drush/bin/drush.php(143): drush_main()
#2 /usr/local/bin/drush(14): require('...')
#3 {main}
thrown in /home/ide/project/vendor/drush/drush/drush.php on line 58
----------------------
Again, Thank much!

Hi@longwave,

Everything good to go now.

Thank you very much for help.

Thanks!

Actually, as a support request, this is fixed.

Automatically closed - issue fixed for 2 weeks with no activity.

I have the same issue. In my case, it's 10.0.x HEAD. I removed the vendor directory and performed a composer install as longwave suggested, which didn't work. However, the reported file's location is different with me. It's `vendor/doctrine/lexer/src/AbstractLexer.php`. Please advise.