I got “The transformer you selected is invalid” error when creating a Facebook Creative via Business API

_x000D_ _x000D_ I'm creating Facebook Dynamic Ads for vehicle vertical for multiple dealerships. The 95% of the times the call to create a creative for a dynamic ad works well, however when the url contains VehicleSearchResults in the URL it fails. This is the call error example using the Python SDK: Path: https://graph.facebook.com/v2.11/act_xxxxxxxxx/adcreatives Params: { 'name': '{{vehicle.price}} - {{vehicle.title}}._CREATIVE', 'product_set_id': u'1234567890', 'url_tags': '', 'object_story_spec': '{ "page_id":"1234567890", "template_data":{ "call_to_action":{ "type":"SHOP_NOW", "value":{ "link":"https://www.mywebpage.com/VehicleSearchResults?search=preowned&model={{vehicle.model | urlencode}}"}}, "description":"","link":"https://www.mywebpage.com/VehicleSearchResults?search=preowned&model={{vehicle.model | urlencode}}", "message":"","name":"{{vehicle.price}} - {{vehicle.title}}"}}', 'template_url_spec': '{ "web":{ "url":"https://www.mywebpage.com/VehicleSearchResults?search=preowned&model={{vehicle.model | urlencode}}"}}', 'applink_treatment': 'web_only' } Response: { "error": { "code": 100, "is_transient": false, "error_subcode": 1487893, "error_user_msg": "The transformer you selected is invalid.", "error_user_title": "The template field transformer is invalid", "message": "Invalid parameter", "type": "OAuthException", "fbtrace_id": "ABhi8rjLjor" } } I followed the guide described here and is in this page where urlencode transformer is mentioned and it works well as long as the text VehicleSearchResults is not present in the URL. When I remove it from the URL the call works well, but I did not find any documentation related to the url transformers and/or use cases and exceptions.