Blackberry 10 screenshot error

I am trying to use bb:system::screenshot like so

request.setTarget("sys.pim.uib.email.previewer");

  // Set the action that the target app should execute
  request.setAction("bb.action.VIEW");

  // Set the MIME type of the data
  request.setMimeType("message/rfc822");

  // Specify the location of the data
  request.setUri(QUrl("pim:message/rfc822:" + QString::number(accountId) +":" + QString::number(messageId)));

  InvokeTargetReply *reply = invokeManager.invoke(request);

  sleep( 2 );

  //Screenshot
  bb::system::Screenshot screenshot;
  QString filename = screenshot.captureDisplay();
  if (filename.isEmpty()) {
      // Something went wrong
      bb::system::ScreenshotError::Type error = screenshot.error();
  }

  //Close Email
  invokeManager.closeChildCard();

The problem is the filename is always empty and screenshot.error() always has error values. Here's what the debugger says at the "something went wrong" line:

screenshot.error() Error: Multiple errors reported.\ Failed to execute MI command: -var-create - * screenshot.error() Error message from debugger back end: Couldn't find method bb::system::screenshot::error\ Unable to create variable object

Not sure what this means?

EDIT: I moved the screenshot variable definition outside the if statement and see this error:

Name : error
    Details:bb::system::ScreenshotError::PermissionDenied
    Default:bb::system::ScreenshotError::PermissionDenied
    Decimal:2
    Hex:0x2
    Binary:10
    Octal:02

Problem is, I definitely have the permissions set correctly:

  <!-- Request permission to execute native code.  Required for native applications. -->
<permission system="true">run_native</permission>
<permission>access_pimdomain_contacts</permission>
<permission>read_device_identifying_information</permission>
<permission>access_pimdomain_messages</permission>
<permission>bbm_connect</permission>
<permission>access_pimdomain_calendars</permission>
<permission>use_camera</permission>
<permission>use_camera_desktop</permission>
<permission>use_gamepad</permission>
<permission>access_internet</permission>
<permission>access_location_services</permission>
<permission>record_audio</permission>
<permission>read_personally_identifiable_information</permission>
<permission>access_pimdomain_notebooks</permission>
<permission>access_notify_settings_control</permission>
<permission>access_phone</permission>
<permission system="true">_sys_inject_voice</permission>
<permission>read_phonecall_details</permission>
<permission>access_pimdomain_calllogs</permission>
<permission>control_phone</permission>
<permission>post_notification</permission>
<permission system="true">_sys_use_consumer_push</permission>
<permission>run_when_backgrounded</permission>
<permission system="true">_sys_run_headless</permission>
<permission system="true">_sys_headless_nostop</permission>
<permission>access_shared</permission>
<permission>access_sms_mms</permission>
<permission>access_wifi_public</permission>

From the docs, I need "Permissions: The application must have the use_camera_desktop and access_shared permissions to use this feature."

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