1e41f4b71Sopenharmony_ci# Application Domain Name Verification Error Codes 2e41f4b71Sopenharmony_ci 3e41f4b71Sopenharmony_ci> **NOTE** 4e41f4b71Sopenharmony_ci> 5e41f4b71Sopenharmony_ci> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md). 6e41f4b71Sopenharmony_ci 7e41f4b71Sopenharmony_ci## 29900001 Internal System Service Error 8e41f4b71Sopenharmony_ci 9e41f4b71Sopenharmony_ci**Error Message** 10e41f4b71Sopenharmony_ci 11e41f4b71Sopenharmony_ciAn internal error has occurred in the system service. 12e41f4b71Sopenharmony_ci 13e41f4b71Sopenharmony_ci**Description** 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_ciThis error code is reported when the system service is abnormal. 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ci**Possible Causes** 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ciThe possible causes are as follows: 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ci1. The application domain name verification service cannot be started. 22e41f4b71Sopenharmony_ci2. The read or write of IPC data fails. 23e41f4b71Sopenharmony_ci 24e41f4b71Sopenharmony_ci**Solution** 25e41f4b71Sopenharmony_ci 26e41f4b71Sopenharmony_ciTry again later or restart the device. 27