EntityMetadataWrapperException by workflow module

The error eliminate but state did not change. This is not the root of problem.

Hmm, but this is strange behaviour. See the complete code below.
The $field_name should either be space or contain a valid fieldname.

// If $field_name is not known, yet, determine it.
  if ($field_name === NULL) {
    $fields = _workflow_info_fields($entity, $entity_type);  // <=== Returns a list of workflow fields.
    if (count($fields)) {
      // Workflow Field API: if $field_name is not known, yet, determine it.
      $field = reset($fields);
      $field_name = $field['field_name'];
    }
    else {
      // Workflow Node API.
      $field_name = '';
    }
  }

  if ($field_name === '') {
    // Workflow Node API: Get current/previous state for a Workflow Node.
    // Multi-language not supported.
    // N.B. Do not use a page cache. This gives problems with Rules.
    $sid = isset($entity->workflow) ? $entity->workflow : FALSE;
  }
  else {
    // At this point, we may have redetermined and altered the field_name.
    if (!$sid && $field_name !== NULL) { // <== Sid is always FALSE, $field_name can't be NULL
      $wrapper = entity_metadata_wrapper($entity_type, $entity);
      // Get State ID for existing nodes (A new node has no sid - will be fetched later.)
      // and normal node, on Node view page / Workflow history tab.
      $sid = $wrapper->{$field_name}->value(); // <=== Line 940
    }
  }

The error is in the providing function _workflow_info_fields(). Is one of you able to debug that function?

Please state:
- which version of Drupal are you using?
- are you using workflow_fiekld or workflow_node?
- is this with any node, or in some special situation?
- I presume the Workflow is set up correctly?

I started getting (almost) the same exact error when accessing any node that uses a workflow after recently updating to Workflow 7.x-2.5 on Drupal 7.41.

The description in /admin/modules led me to believe I should be using workflow_node and not workflow_field (at least for now).

The only difference I have from the OP's issue is that my error is thrown in entity.wrapper.inc on line 335:

318  /**
319   * Gets the info about the given property.
320   *
321   * @param $name
322   *   The name of the property. If not given, info about all properties will
323   *   be returned.
324   * @throws EntityMetadataWrapperException
325   *   If there is no such property.
326   * @return
327   *   An array of info about the property.
328   */
329  public function getPropertyInfo($name = NULL) {
330    $this->spotInfo();
331    if (!isset($name)) {
332      return $this->propertyInfo['properties'];
333    }
334    if (!isset($this->propertyInfo['properties'][$name])) {
335      throw new EntityMetadataWrapperException('Unknown data property ' . check_plain($name) . '.');
336    }
337    return $this->propertyInfo['properties'][$name] + $this->info['property defaults'] + $this->propertyInfoDefaults;
338  }

For the meantime I've employed the same hackaround as the OP, but I'd be interested in a proper fix.

@mitokens, is it still happening with the dev version?
today, there was another change in the code from #4.

Can someone also give a dpm (debug_backtrace ()) ?
( dpm needs devel module)

@mitokens, i dont understand why you are doubting. What was the submodule you were using before update? From which version do you come?

I updated to Workflow 7.x-2.x-dev. I am no longer able to reproduce the error.

(oops, ignore double-post.)

Closing this very old issue.