Updated the contact errors

ref #104

src/errors/GroupContactErrors.ts

@@ -2,18 +2,7 @@ import { IsString } from 'class-validator';
 import { NotAcceptableError, NotFoundError } from 'routing-controllers';
 
 /**
- * Error to throw, when a provided groupContact doesn't belong to the accepted types.
+ * Error to throw, when a non-existent contact get's requested.
- */
-export class GroupContactWrongTypeError extends NotAcceptableError {
-	@IsString()
-	name = "GroupContactWrongTypeError"
-
-	@IsString()
-	message = "The groupContact must be an existing groupContact's id. \n You provided a object of another type."
-}
-
-/**
- * Error to throw, when a non-existent groupContact get's loaded.
  */
 export class GroupContactNotFoundError extends NotFoundError {
 	@IsString()
@@ -22,3 +11,15 @@ export class GroupContactNotFoundError extends NotFoundError {
 	@IsString()
 	message = "The groupContact you provided couldn't be located in the system. \n Please check your request."
 }
+
+/**
+ * Error to throw when two contacts' ids don't match.
+ * Usually occurs when a user tries to change a contact's id.
+ */
+export class GroupContactIdsNotMatchingError extends NotAcceptableError {
+	@IsString()
+	name = "GroupContactIdsNotMatchingError"
+
+	@IsString()
+	message = "The ids don't match! \n And if you wanted to change a contact's id: This isn't allowed!"
+}