Change what error (1) is used for

hints/1.md

@@ -9,8 +9,10 @@ If you let their support team know about this error, please give them a link to
 
 ## Info for Developers
 
-When you initialize your Elm application, you are not providing any flags like `Elm.App.fullscreen()` but the application needs some flags.
+The application transitioned to a new URL, but the `Url.Parser.toUrl` function could not handle it. It probably is an unsupported URL like a `file://` or `data://` URL but it may be a bug in the [`elm-lang/url`][url] package. Explore more and report an [SSCCE](http://sscce.org/) if you can definitively show it is a bug.
 
 You can get more detailed information if you can reproduce the error in dev mode.
 
 Hopefully that helps!
+
+[url]: https://github.com/elm-lang/url

src/Elm/Kernel/Error.js

@@ -21,13 +21,12 @@ function _Error_throw__DEBUG(identifier, fact1, fact2, fact3, fact4)
 			throw new Error('The `' + moduleName + '` module does not need flags.\nInitialize it with no arguments and you should be all set!');
 
 		case 1:
-			var moduleName = fact1;
-			throw new Error('Are you trying to sneak a Never value into Elm? Trickster!\nIt looks like ' + moduleName + '.main is defined with `programWithFlags` but has type `Program Never`.\nUse `program` instead if you do not want flags.');
+			var url = fact1;
+			throw new Error('Cannot navigate to the following URL. It seems to be invalid:\n' + url);
 
 		case 2:
-			var moduleName = fact1;
-			var message = fact2;
-			throw new Error('Trying to initialize the `' + moduleName + '` module with an unexpected argument.\nI tried to convert it to an Elm value, but ran into this problem:\n\n' + message);
+			var message = fact1;
+			throw new Error('Problem with the flags given to your Elm program on initialization.\n\n' + message);
 
 		case 3:
 			var portName = fact1;