Invalid template error when integrating custom webhook trigger with Microsoft Flow

Question

I am trying to create a custom webhook trigger in Microsoft Flow. I created one sample application in which I implemented the webhook service. The application calls hooks when events occur.

I tried to integrate my webhook server with Microsoft Flow by contacting link

I created swagger and added a trigger from the thread UI, but in the end I get the following error

"InvalidTemplate. Unable to process template language expressions for trigger 'When_File_get_created_in_project_share' at line '1' and column '4703': 'The template language function 'ListCallbackUrl' is not supported by triggers of type 'ApiConnection'.'." 

Please, help.