1# Notification 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## 1600001 Internal Error 8 9**Error Message** 10 11Internal error. 12 13**Description** 14 15This error code is reported when an error occurs during internal processing, such as multi-thread processing or internal pointer checks. 16 17**Cause** 18 19Common kernel errors such as multi-thread processing and internal processing errors occur. 20 21**Solution** 22 23Make sure the system resources are sufficient. 24 25## 1600002 Marshalling or Unmarshalling Error 26 27**Error Message** 28 29marshalling or unmarshalling error. 30 31**Description** 32 33This error code is reported when a marshalling or unmarshalling error occurs before data transmission. 34 35**Cause** 36 37A parameter mismatch is detected between the application and the notification service. 38 39**Solution** 40 41Make sure the application SDK version matches the system version. 42 43## 1600003 Failed to Connect to the Notification Service 44 45**Error Message** 46 47Failed to connect service. 48 49**Description** 50 51This error code is reported when the application fails to connect to the notification service. 52 53**Cause** 54 55The notification service is busy or abnormal. 56 57**Solution** 58 59Restart the system. 60 61## 1600004 Notification Disabled 62 63**Error Message** 64 65Notification is not enabled. 66 67**Description** 68 69This error code is reported when notification is disabled. 70 71**Cause** 72 73The notification feature is not enabled for the application. 74 75**Solution** 76 77Enable notification for the application in the notification settings. 78 79## 1600005 Notification Slot Disabled 80 81**Error Message** 82 83Notification slot is not enabled. 84 85**Description** 86 87This error code is reported when the notification slot is not available. 88 89**Cause** 90 91The notification slot is disabled or has not been added. 92 93**Solution** 94 951. Access the notification settings and check whether the application has the notification slot. If no, add it. 96 972. Make sure the notification slot is enabled. 98 99## 1600006 Notification Deletion Failed 100 101**Error Message** 102 103Notification is not allowed to remove. 104 105**Description** 106 107This error code is reported when notification deletion is disabled. 108 109**Cause** 110 111The notification attribute **isUnremovable** is set to true. 112 113**Solution** 114 115Set **isUnremovable** as needed. For details, see [NotificationRequest](../apis/js-apis-notificationManager.md#notificationrequest). 116 117## 1600007 Notification Not Found 118 119**Error Message** 120 121The notification is not exist. 122 123**Description** 124 125This error code is reported when the notification service could not find the notification. 126 127**Cause** 128 129The notification has been canceled or deleted. 130 131**Solution** 132 133N/A 134 135## 1600008 User Not Found 136 137**Error Message** 138 139The user is not exist. 140 141**Description** 142 143This error code is reported when the specified user is not found in the information system. 144 145**Cause** 146 147The user information passed is incorrect. 148 149**Solution** 150 151Verify the user information. 152 153## 1600009 Notification Sending Limit Reached 154 155**Error Message** 156 157Over max number notifications per second. 158 159**Description** 160 161This error code is reported when the notification sending frequency reaches the upper limit. 162 163**Cause** 164 165More than 10 notifications are sent per second. 166 167**Solution** 168 169Reduce the notification sending frequency to no more than 10 per second. 170 171## 16000010 Distributed Operation Failed 172 173**Error Message** 174 175Distributed operation failed. 176 177**Description** 178 179This error code is reported when an error occurs with the distributed database operation or distributed API invoking. 180 181**Cause** 182 183The distributed database could not be operated or the distributed API could not be invoked. 184 185**Solution** 186 187Verify the distributed connection. 188 189## 16000011 Failed to Read the Template Configuration 190 191**Error Message** 192 193Read template config failed. 194 195**Description** 196 197This error code is reported when the attempt to read the template configuration file fails. 198 199**Cause** 200 201The template configuration file is lost in the system. 202 203**Solution** 204 205Check for the template configuration file: /system/etc/notification_template/external.json. 206 207## 16000012 Insufficient Memory Space 208 209**Error Message** 210 211No memory space. 212 213**Description** 214 215This error code is reported when a memory allocation error occurs. 216 217**Cause** 218 219A memory allocation error occurs. 220 221**Solution** 222 223Ensure sufficient system memory. 224