I have a simple Workflow where I assign a task and write to history some text after the task is approved. The problem is when I approve the task, the workflow gets stuck and refuse to run further even though the task is already changed to "Approved".
Workflow Health only shows this error message
Retrying last request. Next attempt scheduled after 10/16/2016 7:30 PM. Details of last request: HTTP InternalServerError to http://win-osqi95jkrf8:8484/DVC2/_api/sp.utilities.utility.SendEmail Correlation Id: 9749cf9f-e74a-1c08-a1a5-702b8549f4cc Instance Id: c3841289-b0f4-4288-bea0-229c3f1e5883 Exception of type 'System.Configuration.ConfigurationErrorsException' was thrown.
From my understanding, this error only prevents the workflow from sending notification emails, not makes it halt altogether.
Any help would be appreciated.
My Workflow: http://imgur.com/ILEzz3K. It's a simple workflow for testing purpose where I assign task and then write to history once the task is completed. However when I approve the task there's nothing written to the history list and the workflow stuck at "Started" stage forever.