# backgroundTaskManager Error Codes

> **NOTE**
>
> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](errorcode-universal.md).

## 9800001 Memory Operation Failure

**Error Message**

Memory operation failed.

**Possible Causes**

1. A memory leak occurs.
2. The system memory is insufficient.

**Solution**

1. Release the memory.
2. Check whether memory leak occurs.

## 9800002 Parcel Operation Failure

**Error Message**

Parcel operation failed.

**Possible Causes**

An exception occurs when invoking the **MessageParcel** object to read or write an object.

**Solution**

Try again later or restart the device.

## 9800003 IPC Failure

**Error Message**

IPC failed.

**Possible Causes**

IPC fails.

**Solution**

Try again later or restart the device.

## 9800004 System Service Failure

**Error Message**

System service operation failed.

**Possible Causes**

1. The system service is not started.
2. The system service is abnormal.

**Solution**

Try again later or restart the device.

## 9800005 Continuous Task Verification Failure

**Error Message**

Continuous task verification failed.

**Possible Causes**

1. The application repeatedly requests a continuous task.
2. The application repeatedly cancels a continuous task.
3. The value of **bgMode** is invalid because no continuous task type is configured for **backgroundModes** in the application's configuration file.
4. A non-PC device requests the continuous task **KEEPING_TASK**, which is available only for PCs.
5. A third-party application requests the continuous task **WIFI_INTERACTION** or **VOIP**, which is available only for system applications.

**Solution**

1. Check the application code.
2. Check whether the application has the system permissions.
3. Check the type of the device where the application is located.
4. Check the value of **backgroundModes**.

## 9800006 Notification Verification Failure

**Error Message**

Notification verification failed.

**Possible Causes**

1. The continuous task resources cached in the resource subsystem fail to be loaded.
2. The notification subsystem functions abnormally.

**Solution**

1. Check for the continuous task resources **ohos.backgroundtaskmgr.resources**.
2. Try again later or restart the device.

## 9800007 Continuous Task Storage Failure

**Error Message**

Task storage failed.

**Possible Causes**

1. Failed to create a file to store the task information.
2. Failed to obtain the file path.
3. Failed to open the file that stores the task information.

**Solution**

1. Check the **/data/service/el1/public/background_task_mgr/running_task** file.
2. Try again later or restart the device.

## 9900001 Caller Information Verification Failure for a Transient Task

**Error Message**

Caller information verification failed for a transient task.

**Possible Causes**

1. Failed to obtain the UID or PID of the caller.
2. Failed to obtain the bundle name of the caller.
3. The request ID passed in the API used to cancel the transient task is invalid.

**Solution**

1. Check whether the application UID exists.
2. Check whether the application has requested a transient task.
3. Try again later or restart the device.

## 9900002 Continuous Task Verification Failure

**Error Message**

Transient task verification failed.

**Possible Causes**

1. The callback passed in **requestSuspendDelay()** already exists.
2. The callback passed in **cancelSuspendDelay()** does not exist.
3. The application attempts to request a transient task 5 seconds after it switches to the background.
4. The application has already requested three transient tasks.
5. The application's daily quota for transient tasks is used up.

**Solution**

1. Check the application code.
2. The application should cancel transient tasks immediately after they are complete.

## 18700001 Caller Information Verification Failure for an Energy Resource Request

**Error Message**

Caller information verification failed when applying for efficiency resources.

**Possible Causes**

1. Failed to obtain the UID or PID of the caller.
2. The value of **resourceTypes **for requesting energy resources exceeds the upper limit.

**Solution**

Check the input parameters.