diff --git a/BookAStar/BookAStar/Helpers/NotIdentifiedException.cs b/BookAStar/BookAStar/Helpers/NotIdentifiedException.cs
new file mode 100644
index 00000000..537143ce
--- /dev/null
+++ b/BookAStar/BookAStar/Helpers/NotIdentifiedException.cs
@@ -0,0 +1,10 @@
+using System;
+
+namespace BookAStar
+{
+    public class NotIdentifiedException : Exception
+    {
+        public NotIdentifiedException(string message) : base(message) { }
+    }
+}
+
diff --git a/BookAStar/BookAStar/Helpers/ServiceNotAvailable1.cs b/BookAStar/BookAStar/Helpers/ServiceNotAvailable1.cs
new file mode 100644
index 00000000..a723cf32
--- /dev/null
+++ b/BookAStar/BookAStar/Helpers/ServiceNotAvailable1.cs
@@ -0,0 +1,10 @@
+using System;
+
+namespace BookAStar
+{
+    public class ServiceNotAvailable : Exception
+    {
+        public ServiceNotAvailable(string message, Exception innerException) : base(message, innerException) { }
+
+    }
+}
\ No newline at end of file