# 991
source: https://developer.mastercard.com/open-finance-us/documentation/errors/error-codes/991/index.md

This error occurs when there's an unexpected server error while processing the request.

|             Title             |                                                                                               Details                                                                                                |
|-------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| **Error Code**                | 991                                                                                                                                                                                                  |
| **Remediation Category**      | Report or Escalate for Investigation                                                                                                                                                                 |
| **HTTP Status**               | 500                                                                                                                                                                                                  |
| **Error Type**                | Request Error                                                                                                                                                                                        |
| **Data Connect Alert**        | Not applicable.                                                                                                                                                                                      |
| **Error Message**             | We have encountered an error in our internal system. Please submit a [support ticket](https://developer.mastercard.com/open-finance-us/documentation/support/index.md#create-a-support-case-in-scm). |
| **End User Message**          | Suggested end user message - "We have encountered an error in our internal system."                                                                                                                  |
| **Common Causes**             | Due to an unexpected system issue, data request cannot be completed.                                                                                                                                 |
| **Troubleshooting Steps**     | Submit a [support ticket](https://developer.mastercard.com/open-finance-us/documentation/support/index.md#create-a-support-case-in-scm) for troubleshooting.                                         |
| **Data Connect Fix Eligible** | No.                                                                                                                                                                                                  |
| **Retriable by End User**     | No.                                                                                                                                                                                                  |
| **Access to Latest Data**     |                                                                                                                                                                                                      |

[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)