I'm getting 409 response code when sending notification via REST API for a one app, for other apps everything is ok, notifications are send without problem. errormessage - The page was not displayed because there was a conflict.

I have an application in Development app status, because i'm still working on application. When i send a notification (for test) server returns this message: [createMessage] => osapiError Object ( [errorCode:private] => 403 [errorMessage:private] => HTTP Error 403.1 - Forbidden: Execute...