I screwed up the upgrade (Did not merge files)

I am now getting this error that I can not get past. Any hints? (ver 2.3 > 2.3.1)

An exception occurred: [ErrorException] [E_WARNING] require(/var/www/wetworx/src/addons/DBTech/eCommerce/vendor/composer/autoload_namespaces.php): Failed to open stream: No such file or directory in src/XF/ComposerAutoload.php on line 49

XF::handlePhpError() in src/XF/ComposerAutoload.php at line 49
require() in src/XF/ComposerAutoload.php at line 49
XF\ComposerAutoload->autoloadNamespaces() in src/XF.php at line 322...

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