Change IllegalArgumentException to ArgumentError.

lib/core/exceptions.dart

Index: lib/core/exceptions.dart
diff --git a/lib/core/exceptions.dart b/lib/core/exceptions.dart
index 01020018cae5b718051a915ef6a213e0ec0d811e..e6ee7ac61cb07065273da5555881591374f705ca 100644
--- a/lib/core/exceptions.dart
+++ b/lib/core/exceptions.dart
@@ -46,13 +46,6 @@ class ObjectNotClosureException implements Exception {
 }
 
 
-class IllegalArgumentException implements Exception {
-  const IllegalArgumentException([arg = ""]) : _arg = arg;
-  String toString() => "Illegal argument(s): $_arg";
-  final _arg;
-}
-
-
 class OutOfMemoryException implements Exception {
   const OutOfMemoryException();
   String toString() => "Out of Memory";