# 42002
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/42002/index.md

This error occurs when the request is malformed or incorrect.

|             Title             |                                                                                                                                                                                                                                                                                      Details                                                                                                                                                                                                                                                                                      |
|-------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 42002                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| **Remediation Category**      | Report or Escalate for Investigation                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| **HTTP Status**               | 503                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| **Error Type**                | Request Error                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| **Data Connect Alert**        | No associated alert.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| **Error Message**             | Aggregation service is temporarily unavailable. Please try again later​.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| **Common Causes**             | This error occurs when a recent request to retrieve latest data coincides with an ongoing data synchronization for the same account. A new refresh cannot be initiated until the current one completes. This is a common scenario when multiple refresh requests are sent in a short period.​​                                                                                                                                                                                                                                                                                    |
| **Troubleshooting Steps**     | * **Wait and retry**: Wait for a short period (3-5 minutes) before retrying the request. This gives the current refresh operation time to complete. * **Check account status** : Call the [Get Customer Account](https://developer.mastercard.com/open-finance-us/documentation/api-reference/index.md#GetCustomerAccounts) endpoint periodically to view the account status. When the data refresh process is successfully completed, `aggregationStatusCode` will return value as 0 and `aggregationSuccessDate` will be greater than or equal to the `aggregationAttemptDate`. |
| **Data Connect Fix Eligible** | No.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| **Retriable by End User**     | No.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| **Access to Latest Data**     | You cannot access the latest data until the issue is resolved.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |

[Full Error List](https://developer.mastercard.com/open-finance-us/documentation/errors/error-list/index.md) \| [Request Errors](https://developer.mastercard.com/open-finance-us/documentation/errors/request-errors/index.md)