Just installed the dev version and got this error. Looks like WebformManagedFileBase is a class in namespace Drupal\webform\Element and in Drupal\webform\Plugin\WebformElement. I've attached a small patch to fix, in case you dont want to change one or the other class names.

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classname_namespace_issue_fix.patch1.22 KBel1_1el
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el1_1el created an issue. See original summary.

  • jrockowitz committed 9e5c93b on 8.x-5.x authored by el1_1el 
    Issue #2886234 by el1_1el: Fatal error: Cannot use Drupal\webform\Plugin...
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jrockowitz CreditAttribution: jrockowitz as a volunteer and at The Big Blue House commented
Status: Active » Fixed

Thanks

Status: Fixed » Closed (fixed)

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