The recommended/supported version is 7.x-5.x
If you're on 7.x-4.x (or below...) you are strongly encouraged to upgrade. The newer 7.x-5.x branch includes many bug fixes along with improvements in the code base, e.g. many direct database queries have been replaced by API calls.
Next week we will be going through the drupal.org webform-civicrm issue queue and ...
You will want to find out where your module lives -> determine whether it lives in /sites/all/modules or in /sites/default/modules
Download a copy of the latest 7.x-5.x from our drupal.org project page: https://www.drupal.org/project/webform_civicrm
Unpack that tar.gz
Then replace what you have in /sites/all/webform_civicrm or /sites/default/...
I dont see any thing on module page that it says not compatible with 7.67 and Civi 5.19. The minimum requirement for 5x is CiviCRM 5.12+ and you are on 5.19. So i dont see any reason why it wont support.
Please see -> What is the recommended/supported version of Webform CiviCRM module for Drupal 7?
First step would be to move to the supported version for D7WFC -> 7.x-5.x
Your error message tells me you're on 7.x-4.x