# Notification Error Codes > **NOTE** > > This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md). ## 1600001 Internal Error **Error Message** Internal error. **Description** This error code is reported when an error occurs during internal processing, such as multi-thread processing or internal pointer checks. **Cause** Common kernel errors such as multi-thread processing and internal processing errors occur. **Solution** Make sure the system resources are sufficient. ## 1600002 Marshalling or Unmarshalling Error **Error Message** Marshalling or unmarshalling error. **Description** This error code is reported when a marshalling or unmarshalling error occurs before data transmission. **Cause** A parameter mismatch is detected between the application and the notification service. **Solution** Make sure the application SDK version matches the system version. ## 1600003 Failed to Connect to the Notification Service **Error Message** Failed to connect to the service. **Description** This error code is reported when the application fails to connect to the notification service. **Cause** The notification service is busy or abnormal. **Solution** Restart the system. ## 1600004 Notification Disabled **Error Message** Notification disabled. **Description** This error code is reported when notification is disabled. **Cause** The notification feature is not enabled for the application. **Solution** Enable notification for the application in the notification settings. ## 1600005 Notification Slot Disabled **Error Message** Notification slot disabled. **Description** This error code is reported when the notification slot is not available. **Cause** The notification slot is disabled or has not been added. **Solution** 1. Access the notification settings and check whether the application has the notification slot. If no, add it. 2. Make sure the notification slot is enabled. ## 1600006 Notification Deletion Failed **Error Message** Notification deletion disabled. **Description** This error code is reported when notification deletion is disabled. **Cause** The notification attribute **isUnremovable** is set to true. **Solution** Enable notification deletion. For details, see [NotificationRequest](./js-apis-inner-notification-notificationRequest.md). ## 1600007 Notification Not Found **Error Message** The notification does not exist. **Description** This error code is reported when the notification service could not find the notification. **Cause** The notification has been canceled or deleted. **Solution** N/A ## 1600008 User Not Found **Error Message** The user does not exist. **Description** This error code is reported when the specified user is not found in the information system. **Cause** The user information passed is incorrect. **Solution** Verify the user information. ## 1600009 Notification Sending Limit Reached **Error Message** The notification sending frequency reaches the upper limit. **Description** This error code is reported when the notification sending frequency reaches the upper limit. **Cause** More than 10 notifications are sent per second, or more than 20 notifications are updated per second. **Solution** Reduce the notification sending frequency to no more than 10 per second. ## 1600010 Distributed Operation Failed **Error Message** Distributed operation failed. **Description** This error code is reported when an error occurs with the distributed database operation or distributed API invoking. **Cause** The distributed database could not be operated or the distributed API could not be invoked. **Solution** Verify the distributed connection. ## 1600011 Failed to Read Template Configuration **Error Message** Failed to read the template configuration. **Description** This error code is reported when the attempt to read the template configuration file fails. **Cause** The template configuration file is lost in the system. **Solution** Check for the template configuration file: /system/etc/notification_template/external.json. ## 1600012 Insufficient Memory Space **Error Message** No memory space. **Description** This error code is reported when a memory allocation error occurs. **Cause** A memory allocation error occurs. **Solution** Ensure sufficient system memory. ## 1600013 Notification Pop-up Window Displayed **Error Message** A notification dialog box is already displayed. **Description** This error code is reported when the notification pop-up window is displayed. **Cause** The notification pop-up window is displayed. **Solution** Check whether the notification pop-up window is displayed. ## 1600014 No Related Permission **Error Message** No permission. **Description** This error code is reported when you do not have the related permission. **Cause** You do not have the related permission. **Solution** Check whether you have the related permission. ## 1600015 Duplicate Configurations not Allowed for the Current Notification Status **Error Message** The current notification status does not support duplicate configurations. **Description** This error code is reported when the current notification status does not support duplicate configurations. **Cause** The current notification status does not support duplicate configurations. **Solution** Check whether the notification status is duplicately configured. ## 1600016 Updated Notification Version Outdated **Error Message** The notification version for this update is too low. **Description** This error code is reported when the notification version for this update is outdated. **Cause** The notification version for this update is outdated. **Solution** Check the notification version. ## 1600017 No Configured Proxy Relationship **Error Message** There is no corresponding agent relationship configuration. **Description** This error code is reported when no proxy relationship is configured. **Cause** No corresponding proxy relationship is configured. **Solution** Check the proxy relationship configuration. ## 1600018 Notification Settings Page Already Displayed **Error Message** The notification settings window is already displayed. **Description** This error code is reported when the notification settings page has been displayed. **Cause** The notification settings page has been displayed. **Solution** Check whether the notification settings page is displayed. ## 1600019 No Configuration Information for a Do Not Disturb Profile **Error Message** The do-not-disturb profile does not exist. **Description** This error code is reported when the configuration information corresponding to the Do Not Disturb profile ID does not exist. **Cause** No configuration information corresponding to the Do Not Disturb profile ID exists. **Solution** Check whether the queried Do Not Disturb profile ID is correct. ## 2300007 Network Access Failure **Error Message** Network unreachable. **Description** This error code is reported when the network cannot be accessed. **Cause** The network cannot be accessed. **Solution** Check the network status. ## 17700001 Bundle Name Not Found **Error Message** The specified bundle name was not found. **Description** This error code is reported when the bundle name is incorrect or the application is not installed. **Cause** 1. The bundle name is incorrect. 2. The application is not installed. **Solution** 1. Verify the bundle name and make sure the application is installed.