Investigate issue in configuring email notifications from Kaui

[reshmabidikar]

There is an issue while configuring email notifications from Kaui. The following exception occurs:

2021-11-09T08:44:40,503+0000 lvl='ERROR', log='Err', th='http-nio-8080-exec-7', xff='', rId='', tok='', aRId='', tRId='1',execution of: POST/v1/accounts/d0753a3d-48e4-465e-8428-2e131584100c resulted in exception
Route:
      | Method | Path                                              | Source                                                                     | Name                                                  | Pattern                   | Consumes | Produces           |
      |--------|---------------------------------------------------|----------------------------------------------------------------------------|-------------------------------------------------------|---------------------------|----------|--------------------|
      | POST   | /v1/accounts/d0753a3d-48e4-465e-8428-2e131584100c | org.killbill.billing.plugin.notification.http.EmailNotificationServlet:100 | /EmailNotificationServlet.doUpdateEventTypePerAccount | /v1/accounts/:kbAccountId | [*/*]    | [application/json] |

Stacktrace:
org.jooby.Err: Server Error(500): Failed to parse body to 'java.util.List<org.killbill.billing.notification.plugin.api.ExtBusEventType>'