Getting error when create octopus release

I am using TFS as a CI tool and using Octopus to deploy my C# Web API project. Build artifacts package pushing and creating release successfully from TFS to octopus side, But When try to deploy for IIS in Assembly server, It's getting error as like this, Please check attached error log.

The line that's throwing that error is this one in Calamari. That function Assert-WebsiteExists only gets invoked when you try to do one of the following:

• A) Deploy a Web Site in IIS under an already existing Web Application.

• B) Deploy a Virtual Directory in IIS under an already existing Web Application.

Both of the above will fail if the parent Web Application (in your case WKLS.Mockservice) doesn't exist before you run that step, which is apparently what's happening in your case.

If you are trying to create the Web Application from that same Octopus deployment process, then you should use this step. If you want to use a Web Application that already exists, then perhaps you just typed the name incorrectly?