diff --git a/packages/flutter_availability_data_interface/lib/src/data_interface.dart b/packages/flutter_availability_data_interface/lib/src/data_interface.dart
index 0ae9c1c..147c4d8 100644
--- a/packages/flutter_availability_data_interface/lib/src/data_interface.dart
+++ b/packages/flutter_availability_data_interface/lib/src/data_interface.dart
@@ -7,6 +7,9 @@ class AvailabilityNotFoundException implements Exception {}
 /// Exception thrown when the requested template can not be found
 class TemplateNotFoundException implements Exception {}
 
+/// Exception thrown when the requested template can not be applied
+class TemplateApplyException implements Exception {}
+
 /// A base interface that defines the communication from the availability user
 /// story to its persistance solution.
 ///