Check for invalid modules when registering a pallet in construct_runtime (#4520)

substrate/frame/elections/src/mock.rs

@@ -154,7 +154,7 @@ frame_support::construct_runtime!(
 		UncheckedExtrinsic = UncheckedExtrinsic
 	{
 		System: system::{Module, Call, Event},
-		Balances: pallet_balances::{Module, Call, Event<T>, Config<T>, Error},
+		Balances: pallet_balances::{Module, Call, Event<T>, Config<T>},
 		Elections: elections::{Module, Call, Event<T>, Config<T>},
 	}
 );