diff --git a/code/HelloWorld/entry/src/main/ets/entryability/EntryAbility.ets b/code/HelloWorld/entry/src/main/ets/entryability/EntryAbility.ets
index b8c877dac17545fcb0420d1228764fd174d1e9d9..383b70a79a76ebd79404ef616d4879d0ea6bf1ec 100644
--- a/code/HelloWorld/entry/src/main/ets/entryability/EntryAbility.ets
+++ b/code/HelloWorld/entry/src/main/ets/entryability/EntryAbility.ets
@@ -15,7 +15,7 @@ class EntryAbility extends UIAbility {
   onWindowStageCreate(windowStage: window.WindowStage): void {
     hilog.info(0x0000, 'testTag', 'EntryAbility onWindowStageCreate');
     try {
-      windowStage.loadContent('pages/Index', (err: BusinessError<void>): void => {
+      windowStage.loadContent('pages/Index', (err: BusinessError<void> | null): void => {
         hilog.info(0x0000, 'testTag', 'loadContent entering');
         MyCallback.runCasesOfCallback();
         if (err) {
diff --git a/code/HelloWorld/entry/src/main/ets/models/MyCallback.ets b/code/HelloWorld/entry/src/main/ets/models/MyCallback.ets
index 708065d57cb910dc5f650d166f31b130b729e6ca..f5885d2bbbccbc584eb349fb4b688d56f33beb41 100644
--- a/code/HelloWorld/entry/src/main/ets/models/MyCallback.ets
+++ b/code/HelloWorld/entry/src/main/ets/models/MyCallback.ets
@@ -13,7 +13,7 @@ export class MyCallback {
     hilog.info(0x0000, 'testTag', 'myAsyncCallback');
     let error = new Error('Business Error', 'basicError2 message', undefined);
     let be2: BusinessError<string> = new BusinessError<string>(SYNTAX_ERROR_CODE, error);
-    callback(be2, 'yAsyncCallback');
+    callback(be2, 'myAsyncCallback');
   }
 
   static myErrorCallback(callback: ErrorCallback<BusinessError<string>>): void {
@@ -28,7 +28,7 @@ export class MyCallback {
     MyCallback.myCallback((data: string) => {
       hilog.info(0x0000, 'testTag', 'MyCallback' + data);
     })
-    MyCallback.myAsyncCallback((error: BusinessError<string>, result: string) => {
+    MyCallback.myAsyncCallback((error: BusinessError<string> | null, result: string | undefined) => {
       if (error && result) {
         hilog.info(0x0000, 'testTag', `myAsyncCallback, error: ${error.message}, result:${result}`);
       }