Failing completeHandler

completeHandler = (e, data)->
    # If the upload didn't succeed, inform the user and display debug
    # information in the console
    if data.textStatus != 'success'
        alert "Noe gikk galt. Debug informasjon er logget i konsollen"
        console.group 'Upload failure'
        console.error data.textStatus
        console.error data.result
        console.groupEnd 'Upload failure'

        # Un-disable the buttons
        selectButton.removeClass 'disabled'
        uploadButton.removeClass 'disabled loading'
        uploadButton.html 'Last opp'

        return

    # Save the response of the file upload
    self.fileUploadResponse = data.result

    # Fetch a preview of the uploaded file
    url = "#{config.api_root}/#{config.api_path_tabulardatafilepreview}"
    $.ajax url,
        type: 'POST'
        dataType: 'json'
        async: false
        data:
            'file_handle': data.result.file_handle
            'rownum': 5

        complete: (req, text_status)->
            # Handle errors
            if text_status != 'success'
                alert "Noe gikk galt. Debug informasjon er logget " + \
                      "i konsollen"
                console.group 'Failed to receive data file preview'
                console.log text_status
                console.log req.responseText
                console.log req
                console.groupEnd 'Failed to receive data file preview'

                # Un-disable the buttons
                selectButton.removeClass 'disabled'
                uploadButton.removeClass 'disabled loading'
                uploadButton.html 'Last opp'

            # Save the preview data and initiate stage 2
            self.previewData = JSON.parse req.responseText
            self.setStage 2