1# Ads Service Framework Error Codes 2 3> **NOTE** 4> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md). 5 6## 21800001 Internal System Error 7 8**Error Message** 9 10System internal error. 11 12**Description** 13 14This error code is reported if an internal system error occurs. 15 16**Possible Causes** 17 18Failed to connect to the OAID service. 19 20**Procedure** 21 22Check whether the service is running properly. 23 24## 21800003 Ad Loading Failure 25 26**Error Message** 27 28Failed to load the ad request. 29 30**Description** 31 32This error code is reported if loading the ad fails. 33 34**Possible Causes** 35 361. The network connection is abnormal. 37 382. Incorrect ad request parameter. 39 403. The server does not have proper ad filling. 41 42**Procedure** 43 441. Check the network status. 45 462. Check whether the ad request parameters meet the requirements based on the API reference. 47 48## 21800004 Ad Display Failure 49 50**Error Message** 51 52Failed to display the ad. 53 54**Description** 55 56This error code is reported if displaying the ad fails. 57 58**Possible Causes** 59 60The network connection is abnormal. 61 62**Procedure** 63 64Check the network status. 65 66## 21800005 Ad Data Parsing Failure 67 68**Error Message** 69 70Failed to parse the ad response. 71 72**Description** 73 74This error code is reported if ad data is failed to be parsed. 75 76**Possible Causes** 77 78Key attributes are missing or the structure of the ad response data is incorrect. 79 80**Procedure** 81 82Check the ad response data. 83 84## 401 Incorrect Ads Request Parameter 85 86**Error Message** 87 88Invalid input parameter. Possible causes: 1. Mandatory parameters are left unspecified. 2. Incorrect parameter types. 3.Parameter verification failed 89 90**Description** 91 92This error code is reported if an ads request parameter is incorrect. 93 94**Possible Causes** 95 96Ads request parameters fail the verification. 97 98**Procedure** 99 100Check whether the ads request parameters are correct. 101 102## 801 Ad Request Failure 103 104**Error Message** 105 106Device not supported. 107 108**Description** 109 110This error code is reported when the device supports the target SysCap but does not support a specific API. 111 112**Possible Causes** 113 114The device does not support the API. 115 116**Procedure** 117 118Check whether the device supports the API. 119