1# Ads Service Framework Error Codes 2 3 4> **NOTE** 5> 6> This topic describes only module-specific error codes. For details about universal error codes, see [Universal Error Codes](../errorcode-universal.md). 7 8 9## 21800001 Internal System Error 10 11**Error Message** 12 13System internal error. 14 15**Description** 16 17This error code is reported if an internal system error occurs. 18 19**Possible Causes** 20 21Failed to connect to the OAID service. 22 23**Procedure** 24 25Check whether the service is running properly. 26 27 28## 21800003 Ad Loading Failure 29 30**Error Message** 31 32Failed to load the ad request. 33 34**Description** 35 36This error code is reported if loading the ad fails. 37 38**Possible Causes** 39 40The network connection is abnormal, or an ad request parameter is incorrect. 41 42**Procedure** 43 44Check the network status, and correct the ad request parameters. 45 46 47## 21800004 Ad Display Failure 48 49**Error Message** 50 51Failed to display the ad. 52 53**Description** 54 55This error code is reported if displaying the ad fails. 56 57**Possible Causes** 58 59The network connection is abnormal. 60 61**Procedure** 62 63Check the network status. 64 65 66## 401 Incorrect Ads Request Parameter 67 68**Error Message** 69 70Invalid input parameter. Possible causes:1. Mandatory parameters are left unspecified. 712.Incorrect parameter types. 3.Parameter verification failed 72 73**Description** 74 75This error code is reported if an ads request parameter is incorrect. 76 77**Possible Causes** 78 79Ads request parameters fail the verification. 80 81**Procedure** 82 83Check whether the ads request parameters are correct. 84 85 86## 801 Ad Request Failure 87 88**Error Message** 89 90Device not support 91 92**Description** 93 94This error code is reported when the device supports the target SysCap but does not support a specific API. 95 96**Possible Causes** 97 98The device does not support the API. 99 100**Procedure** 101 102Check whether the device supports the API. 103