# Application Domain Name Verification Error Codes

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

## 29900001 Internal System Service Error

**Error Message**

An internal error has occurred in the system service.

**Description**

This error code is reported when the system service is abnormal.

**Possible Causes**

The possible causes are as follows:

1. The application domain name verification service cannot be started.
2. The read or write of IPC data fails.

**Solution**

Try again later or restart the device.