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    Nintex Knowledge Base

    Error "An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException: HTTP 400"

    Summary
    When running a workflow with a Send an Email action, the workflow might fail with the following error: An unhandled exception occurred during the execution of the workflow instance. Exception details: System.ApplicationException: HTTP 400

    Solution
    1. Delete the current Send an Email action from the workflow and create a new one.
    2. Open action to configure it.
    3. Select the 'External Recipients' check box.
    4. Input desired email addresses.
    5. Save workflow and publish.