diff --git a/lib/cli/cli.dart b/lib/cli/cli.dart
index d9cbba7..dbea453 100644
--- a/lib/cli/cli.dart
+++ b/lib/cli/cli.dart
@@ -121,8 +121,8 @@ class CLI {
   }
 
   static final commandNameSpace = 21;
-  static get serviceName => CLI.current.config.serviceName;
-  static get executableFileName => CLI.current.config.executableFileName;
+  static String get serviceName => CLI.current.config.serviceName;
+  static String get executableFileName => CLI.current.config.executableFileName;
 
   static Future print(List<String> printList,
       {Color? color, Color? background}) async {
diff --git a/lib/oto/application.dart b/lib/oto/application.dart
index 3c0b877..ab9d584 100644
--- a/lib/oto/application.dart
+++ b/lib/oto/application.dart
@@ -52,7 +52,7 @@ class Application {
   late Pipeline pipeline;
   late BuildType _buildType;
 
-  get buildType {
+  BuildType get buildType {
     return _buildType;
   }
 
diff --git a/lib/oto/commands/build/build_ios.dart b/lib/oto/commands/build/build_ios.dart
index b5408a5..05acb10 100644
--- a/lib/oto/commands/build/build_ios.dart
+++ b/lib/oto/commands/build/build_ios.dart
@@ -68,7 +68,7 @@ class BuildiOS extends Command {
         'REPLACED_WITH_NEW_VERSION'
       ];
       List<dynamic> jsonArr;
-      String? readyForSaleVersion = null;
+      String? readyForSaleVersion;
       for (var item in arr) {
         if (item.contains(result)) {
           jsonArr =
@@ -123,7 +123,7 @@ class BuildiOS extends Command {
       if (targetBuildNumber == null) {
         throw Exception('Can not find target build number.');
       }
-      buildNumber = incrementVersion(targetBuildNumber, fixedLength: 4);
+      buildNumber = incrementVersion(targetBuildNumber, fixedLength: 4, reverse: true );
     }
 
     String? target = data.target;
diff --git a/lib/oto/commands/command.dart b/lib/oto/commands/command.dart
index ca3288d..f40834a 100644
--- a/lib/oto/commands/command.dart
+++ b/lib/oto/commands/command.dart
@@ -270,7 +270,7 @@ abstract class Command {
     if (match == null) {
       throw Exception('Please put the correct value. (ex: <@property.value>)');
     }
-    tag = match!.group(2)!;
+    tag = match.group(2)!;
     if (tag.startsWith('property')) {
       var key = tag.replaceFirst('property.', '');
       Application.instance.property[key] = value;