HarmonyOS官方文档kvstore持久化在使用kvStore.put()和kvStore.get方法的过程中会报错

const KEY_TEST_STRING_ELEMENT = 'key_test_string'; 
const VALUE_TEST_STRING_ELEMENT = 'value_test_string'; 
try { 
  if (this.kvStore) { 
    this.kvStore.put(KEY_TEST_STRING_ELEMENT, VALUE_TEST_STRING_ELEMENT, (err) => { 
      if (err !== undefined) { 
        console.error(`Failed to put data. Code======:${err.code},message:${err.message}`); 
        return; 
      } 
      console.info('Succeeded in putting data======.'); 
    }); 
  } 
} catch (e) { 
  let error = e as BusinessError; 
  console.error(`An unexpected error occurred======. Code:${error.code},message:${error.message}`); 
}