def _get_submission_error(domain, instance_xml, error, auth_context):
"""
Handle's a hard failure from posting a form to couch.
:returns: xform error instance with raw xml as attachment
"""
try:
message = str(error)
except UnicodeDecodeError:
message = str(str(error), encoding='utf-8')
xform = FormProcessorInterface(domain).submission_error_form_instance(instance_xml, message)
xform.auth_context = auth_context
return FormProcessingResult(xform)
