1# Bluetooth 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## 2900001 8 9**Error Message** 10 11Service stopped. 12 13**Description** 14 15The Bluetooth service is stopped, and the APIs related to the Bluetooth service cannot be called. 16 17**Possible Causes** 18 19The Bluetooth service fails to start. 20 21**Solution** 22 23Start the Bluetooth service. 24 25## 2900003 26 27**Error Message** 28 29Bluetooth switch is off. 30 31**Description** 32 33Bluetooth is disabled. 34 35**Possible Causes** 36 37Bluetooth is disabled. 38 39**Solution** 40 41Enable Bluetooth. 42 43## 2900004 44 45**Error Message** 46 47Profile is not supported. 48 49**Description** 50 51The profile is not supported. 52 53**Possible Causes** 54 55The profile is not supported by the device. 56 57**Solution** 58 59Check whether the device supports the profile. Use a profile supported by the device. 60 61## 2900005 62 63**Error Message** 64 65This device not connected. 66 67**Description** 68 69The device is not connected to Bluetooth. 70 71**Possible Causes** 72 73The device pairing fails. 74 75**Solution** 76 77Turn on Bluetooth again to start the pairing process. 78 79## 2900006 80 81**Error Message** 82 83Max connection has reached. 84 85**Description** 86 87The number of connections reaches the maximum. 88 89**Possible Causes** 90 91The number of connections reaches the limit. 92 93**Solution** 94 95Check whether the number of paired devices reaches the threshold. 96 97## 2900008 98 99**Error Message** 100 101Proxy is nullptr. 102 103**Description** 104 105**pimpl** or **proxy** is null. 106 107**Possible Causes** 108 109The device pairing fails. 110 111**Solution** 112 113Turn on Bluetooth again to start the pairing process. 114 115## 2900099 116 117**Error Message** 118 119Operation failed. 120 121**Description** 122 123The operation failed. 124 125**Possible Causes** 126 127The profile is not supported by the device. 128 129**Solution** 130 131Perform this operation again. 132 133## 2900100 134 135**Error Message** 136 137IPC transmit failed. 138 139**Description** 140 141IPC data transmission fails. 142 143**Possible Causes** 144 145The input data is incorrect. 146 147**Solution** 148 149Check the input data. 150 151## 2901000 152 153**Error Message** 154 155Read forbidden. 156 157**Description** 158 159The read operation is not allowed. 160 161**Possible Causes** 162 163The caller does not have the read permission. 164 165**Solution** 166 167Check that the caller has the read permission. 168 169## 2901001 170 171**Error Message** 172 173Write forbidden. 174 175**Description** 176 177The write operation is not allowed. 178 179**Possible Causes** 180 181The caller does not have the write permission. 182 183**Solution** 184 185Check that the caller has the write permission. 186 187## 2901054 188 189**Error Message** 190 191IO error. 192 193**Description** 194 195The I/O operation failed. 196 197**Possible Causes** 198 199The I/O transmission is abnormal. 200 201**Solution** 202 203Perform the operation again. 204