Several errors were reported before and other error is identified after upgrading to Drupal 7.50:
User warning: The following module is missing from the file system: media_wysiwyg. In order to fix this, put the module back in its original location. For more information, see the documentation page. in _drupal_trigger_error_with_delayed_logging() (line 1128 of /.../includes/bootstrap.inc).
However there is NO such module "media_wysiwyg" and it is not clear how to correct this issue.
Is there any support to eliminate these errors?