fix #389 update router context error message

Author: ryansolid

.changeset/nervous-pots-stare.md

@@ -0,0 +1,5 @@
+---
+"@solidjs/router": patch
+---
+
+fix #389 update router context error message

src/routing.ts

@@ -53,7 +53,7 @@ export const RouterContextObj = createContext<RouterContext>();
 export const RouteContextObj = createContext<RouteContext>();
 
 export const useRouter = () =>
-  invariant(useContext(RouterContextObj), "Make sure your app is wrapped in a <Router />");
+  invariant(useContext(RouterContextObj), "<A> and 'use' router primitives can be only used inside a Route.");
 
 let TempRoute: RouteContext | undefined;
 export const useRoute = () => TempRoute || useContext(RouteContextObj) || useRouter().base;