1# Application Domain Name Verification Error Codes
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3> **NOTE**
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5> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md).
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7## 29900001 Internal System Service Error
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9**Error Message**
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11An internal error has occurred in the system service.
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13**Description**
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15This error code is reported when the system service is abnormal.
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17**Possible Causes**
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19The possible causes are as follows:
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211. The application domain name verification service cannot be started.
222. The read or write of IPC data fails.
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24**Solution**
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26Try again later or restart the device.
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