feat: update schematics exceptions

npm/ng-packs/packages/schematics/src/enums/exception.ts

@@ -1,5 +1,8 @@
 export const enum Exception {
-  InvalidWorkspace = 'Invalid Workspace: The angular.json should be a valid JSON file.',
-  NoProject = 'Unknown Project: Either define a default project in your workspace or specify the project name in schematics options.',
-  NoWorkspace = 'Workspace Not Found: Make sure you are running schematics at the root directory of your workspace and it has an angular.json file.',
+  FileNotFound = '[File Not Found] There is no file at "{0}" path.',
+  InvalidWorkspace = '[Invalid Workspace] The angular.json should be a valid JSON file.',
+  NoApi = '[API Not Available] Please double-check the source url and make sure your application is up and running.',
+  NoProject = '[Project Not Found] Either define a default project in your workspace or specify the project name in schematics options.',
+  NoWorkspace = '[Workspace Not Found] Make sure you are running schematics at the root directory of your workspace and it has an angular.json file.',
+  RequiredApiUrl = '[API URL Required] API URL cannot be resolved. Please re-run the schematics and enter the URL to get API definitions from.',
 }