Symfony EventDispatcherExtension configuration error

[grekpg]

I try add to config payum evens extension

payum.extension.event_dispatcher:
  class: Payum\Core\Bridge\Symfony\Extension\EventDispatcherExtension
  arguments: ["@event_dispatcher"]
  public: true
  tags:
    - { name: payum.extension, all: true, prepend: false }

get error

Argument 1 passed to Payum\Core\Gateway::addExtension() must implement interface Payum\Core\Extension\ExtensionInterface, string given, called in /application/vendor/payum/core/Payum/Core/CoreGatewayFactory.php on line 249

[grekpg]

I found working solution

payum.extension.event_dispatcher:
  class: Payum\Core\Bridge\Symfony\Extension\EventDispatcherExtension
  arguments: ["@event_dispatcher"]
  public: true
  tags:
    - { name: payum.extension, all: true, prepend: true }

change prepend: false to prepend: true