Add invalildUsername and invalidUUID errors

client/src/errors/index.ts

@@ -1,7 +1,7 @@
 //Re-exporting for simpler importing
 
-import NotYetImplementedError from './notYetImplemented';
+import NotYetImplemented from './notYetImplemented';
+import InvalidUsername from './invalidUserName';
+import InvalidUUID from './invalidUUID';
 
-export default {
-    NotYetImplementedError
-};
+export {NotYetImplemented, InvalidUsername, InvalidUUID};

client/src/errors/invalidUUID.ts

@@ -0,0 +1,9 @@
+import Error from './error';
+
+export default class InvalidUUID extends Error {
+    name = "InvalidUUID";
+    constructor() {
+        super("Invalid UUID format");
+        this.stack = (<any>new Error("Invalid UUID format")).stack;
+    }
+}

client/src/errors/invalidUsername.ts

@@ -0,0 +1,9 @@
+import Error from './error';
+
+export default class InvalidUsername extends Error {
+    name = "InvalidUsername";
+    constructor() {
+        super("Invalid username provided");
+        this.stack = (<any>new Error("Invalid username provided")).stack;
+    }
+}