1# Device Attestation Error Codes
2
3> **NOTE**
4>
5> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md).
6
7## 20000001 System Service Abnormal
8
9**Error Information**
10
11System service exception, please try again or reboot your device.
12
13**Description**
14
15System service error. Try again or restart the device.
16
17**Possible Causes**
18
191. The system service stops running.
20
212. The internal communication of system services is abnormal.
22
23**Solution**
24
25Check whether the system services are running properly.
26
271. Run the following command on the console to view the current system service list:
28
29    ```bash
30    > hdc shell hidumper -ls
31    ```
32
332. Check whether **devattest_service** is present on the system service list.
34