1# Certificate Management Dialog Box 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## 29700001 Internal Error 8 9**Error Message** 10 11Internal error. 12 13**Possible Causes** 14 15An internal error occurs when the API is called. 16 17**Solution** 18 19Check for and rectify the internal error. 20 21## 29700002 Operation Canceled 22 23**Error Message** 24 25The user cancels the installation operation. 26 27**Possible Causes** 28 29The user canceled the operation when the API was called. 30 31**Solution** 32 33No action is required. 34 35## 29700003 Failed to Install the Certificate 36 37**Error Message** 38 39The installation of the user certificate failed in the certificate manager dialog, for example, the certificate is in an invalid format. 40 41**Possible Causes** 42 43The certificate installation fails. 44 45**Solution** 46 47Check for incorrect certificate format and data. 48 49## 29700004 Operation Not Supported by the Device 50 51**Error Message** 52 53The API is not supported on this device. 54 55**Possible Causes** 56 57The API is available only for a PC application. 58 59**Solution** 60 61Ensure that the caller is running on a PC. 62 63## 29700005 Invalid Operation 64 65**Error Message** 66 67The operation does not comply with the device security policy, such as the device does not allow users to manage the ca certificate of the global user. 68 69**Possible Causes** 70 71The device is not an enterprise device. 72 73**Solution** 74 75Call the API on an enterprise device. 76