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lib/core/error/failures.dart

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+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'failures.freezed.dart';
+
+@freezed
+sealed class Failure with _$Failure {
+  const factory Failure.server({
+    required String message,
+    @Default(500) int statusCode,
+  }) = ServerFailure;
+
+  const factory Failure.cache({
+    required String message,
+  }) = CacheFailure;
+
+  const factory Failure.network({
+    @Default('네트워크 연결을 확인해주세요') String message,
+  }) = NetworkFailure;
+
+  const factory Failure.unauthorized({
+    @Default('인증이 필요합니다') String message,
+  }) = UnauthorizedFailure;
+
+  const factory Failure.unknown({
+    @Default('알 수 없는 오류가 발생했습니다') String message,
+  }) = UnknownFailure;
+}