please help!

[maduranga]

"Dynamically-related files cannot be discovered because a testing server is not define" how to resolve this.

[Jon Fritz]

Here is some information on setting up a testing server for DW: https://www.adobe.com/devnet/archive/dreamweaver/articles/setup_testing_server.html

The information is for an older version of DW, but still works the same way in the latest.

[Paul-M]

If you're on a Windows machine EasyPHP is a good solution for setting up an Apache server with PHP/MySQL ... If you can provide more info I think you'll get better help

[Nancy OShea]

I use Wamp server on a Windows 10 machine. 

Go to Site > Manage Sites...  See screenshots.

Local Site in Local Testing Server

Add Testing Server

Basic Tab

Localhost

Advanced Tab

Server model

Final screen

Final screen