Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in /home/.sites/939/site4167048/web/2020/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraint.php:15
Stack trace:
#0 {main}
  thrown in /home/.sites/939/site4167048/web/2020/core/modules/path/src/Plugin/Validation/Constraint/PathAliasConstraint.php on line 15