1e41f4b71Sopenharmony_ci# Network Connection Management 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## 2100001 Invalid Parameter Value 8e41f4b71Sopenharmony_ci 9e41f4b71Sopenharmony_ci**Error Message** 10e41f4b71Sopenharmony_ci 11e41f4b71Sopenharmony_ciInvalid parameter value. 12e41f4b71Sopenharmony_ci 13e41f4b71Sopenharmony_ci**Description** 14e41f4b71Sopenharmony_ci 15e41f4b71Sopenharmony_ciThis error code is reported if the parameter value is invalid. 16e41f4b71Sopenharmony_ci 17e41f4b71Sopenharmony_ci**Cause** 18e41f4b71Sopenharmony_ci 19e41f4b71Sopenharmony_ciThe input parameter value is not within the valid value range. 20e41f4b71Sopenharmony_ci 21e41f4b71Sopenharmony_ci**Procedure** 22e41f4b71Sopenharmony_ci 23e41f4b71Sopenharmony_ciCheck whether the input parameter value is within the valid value range. 24e41f4b71Sopenharmony_ci 25e41f4b71Sopenharmony_ci## 2100002 Service Connection Failure 26e41f4b71Sopenharmony_ci 27e41f4b71Sopenharmony_ci**Error Message** 28e41f4b71Sopenharmony_ci 29e41f4b71Sopenharmony_ciFailed to connect to the service. 30e41f4b71Sopenharmony_ci 31e41f4b71Sopenharmony_ci**Description** 32e41f4b71Sopenharmony_ci 33e41f4b71Sopenharmony_ciThis error code is reported if a service connection failure occurs. 34e41f4b71Sopenharmony_ci 35e41f4b71Sopenharmony_ci**Cause** 36e41f4b71Sopenharmony_ci 37e41f4b71Sopenharmony_ciThe service is abnormal. 38e41f4b71Sopenharmony_ci 39e41f4b71Sopenharmony_ci**Procedure** 40e41f4b71Sopenharmony_ci 41e41f4b71Sopenharmony_ciCheck whether system services are running properly. 42e41f4b71Sopenharmony_ci 43e41f4b71Sopenharmony_ci## 2100003 System Internal Error 44e41f4b71Sopenharmony_ci 45e41f4b71Sopenharmony_ci**Error Message** 46e41f4b71Sopenharmony_ci 47e41f4b71Sopenharmony_ciSystem internal error. 48e41f4b71Sopenharmony_ci 49e41f4b71Sopenharmony_ci**Description** 50e41f4b71Sopenharmony_ci 51e41f4b71Sopenharmony_ciThis error code is reported if a system internal error occurs. 52e41f4b71Sopenharmony_ci 53e41f4b71Sopenharmony_ci**Cause** 54e41f4b71Sopenharmony_ci 55e41f4b71Sopenharmony_ci1. The memory is abnormal. 56e41f4b71Sopenharmony_ci 57e41f4b71Sopenharmony_ci2. A null pointer is present. 58e41f4b71Sopenharmony_ci 59e41f4b71Sopenharmony_ci**Procedure** 60e41f4b71Sopenharmony_ci 61e41f4b71Sopenharmony_ci1. Check whether the memory space is sufficient. If not, clear the memory and try again. 62e41f4b71Sopenharmony_ci 63e41f4b71Sopenharmony_ci2. Check whether the system is normal. If not, try again later or restart the device. 64e41f4b71Sopenharmony_ci 65e41f4b71Sopenharmony_ci## 2101007 Callback Not Exist 66e41f4b71Sopenharmony_ci 67e41f4b71Sopenharmony_ci**Error Message** 68e41f4b71Sopenharmony_ci 69e41f4b71Sopenharmony_ciThe callback does not exist. 70e41f4b71Sopenharmony_ci 71e41f4b71Sopenharmony_ci**Description** 72e41f4b71Sopenharmony_ci 73e41f4b71Sopenharmony_ciThis error code is reported if a **callback** object to be unregistered does not exist. 74e41f4b71Sopenharmony_ci 75e41f4b71Sopenharmony_ci**Cause** 76e41f4b71Sopenharmony_ci 77e41f4b71Sopenharmony_ciThe **callback** object has not been registered for activating a network or listening to network status changes. 78e41f4b71Sopenharmony_ci 79e41f4b71Sopenharmony_ci**Procedure** 80e41f4b71Sopenharmony_ci 81e41f4b71Sopenharmony_ciBefore unregistering a **callback** object, make sure that it has been registered for activating a network or listening to network status changes. 82e41f4b71Sopenharmony_ci 83e41f4b71Sopenharmony_ci## 2101008 Callback Already Exists 84e41f4b71Sopenharmony_ci 85e41f4b71Sopenharmony_ci**Error Message** 86e41f4b71Sopenharmony_ci 87e41f4b71Sopenharmony_ciThe callback already exists. 88e41f4b71Sopenharmony_ci 89e41f4b71Sopenharmony_ci**Description** 90e41f4b71Sopenharmony_ci 91e41f4b71Sopenharmony_ciThis error code is reported if the same callback already exists. 92e41f4b71Sopenharmony_ci 93e41f4b71Sopenharmony_ci**Cause** 94e41f4b71Sopenharmony_ci 95e41f4b71Sopenharmony_ciThe **callback** object has been registered for activating a network or listening to network status changes. 96e41f4b71Sopenharmony_ci 97e41f4b71Sopenharmony_ci**Procedure** 98e41f4b71Sopenharmony_ci 99e41f4b71Sopenharmony_ci1. Check whether the **callback** object has been registered. 100e41f4b71Sopenharmony_ci2. If the **callback** object has been registered, use the registered **callback** object. 101e41f4b71Sopenharmony_ci 102e41f4b71Sopenharmony_ci 103e41f4b71Sopenharmony_ci## 2101022 Number of Requests Exceeding the Maximum 104e41f4b71Sopenharmony_ci 105e41f4b71Sopenharmony_ci**Error Message** 106e41f4b71Sopenharmony_ci 107e41f4b71Sopenharmony_ciThe number of requests exceeded the maximum allowed. 108e41f4b71Sopenharmony_ci 109e41f4b71Sopenharmony_ci**Description** 110e41f4b71Sopenharmony_ci 111e41f4b71Sopenharmony_ciThis error code is reported if the number of network requests exceeds the maximum. 112e41f4b71Sopenharmony_ci 113e41f4b71Sopenharmony_ci**Cause** 114e41f4b71Sopenharmony_ci 115e41f4b71Sopenharmony_ciThe number of requests for activating a network or listening to network status changes has reached the maximum value. 116e41f4b71Sopenharmony_ci 117e41f4b71Sopenharmony_ci**Procedure** 118e41f4b71Sopenharmony_ci 119e41f4b71Sopenharmony_ciLocate the fault based on the "Over the max request number" log record. 120