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# Event Store errors

> This reference provides details on Event Store errors, including error codes, messages, and possible remedies for each issue.

This reference provides details on Event Store errors, including error codes, messages, and possible remedies for each issue.

Error code range: 70002271–70002280

| Code     | Error Code                                                      | Error Message                                                                                                     | Possible Remedy                                                                                          |
| -------- | --------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| 70002271 | EVENT_STORE_IMMUTABLE                                           | The event store “\[Event Store Name]” cannot be modified while it is in use.                                      | Stop all meters using this event store before making changes.                                            |
| 70002272 | EVENT_STORE_CANNOT_DELETE_WHEN\_​REFERENCED_BY_METER            | The event store cannot be deleted because it is referenced by meter “\[Meter Name]”.                              | Remove the event store reference from the meter before deleting it.                                      |
| 70002273 | EVENT_STORE_NAME_ALREADY_EXISTS                                 | The event store name “\[Event Store Name]” is already in use. Please choose a different name.                     | Choose a unique name for the event store.                                                                |
| 70002274 | EVENT_DEFINITION_CANNOT_UPDATE_WHEN\_​REFERENCED_BY_EVENT_STORE | This event definition cannot be updated because it is referenced by the active event store “\[Event Store Name]”. | Stop the event store or dissociate the event definition before updating it.                              |
| 70002275 | EVENT_DEFINITION_CANNOT_DELETE_WHEN\_​REFERENCED_BY_EVENT_STORE | This event definition cannot be deleted because it is referenced by event store “\[Event Store Name]”.            | Remove the event store's reference to this event definition before deleting it.                          |
| 70002276 | EVENT_DEFINITION_EVENT_ID_FIELD_NOT_FOUND_IN_PROPERTIES         | The event ID field “\[Field Name]” was not found in the schema properties.                                        | Add the event ID field to the schema properties or update the event ID designation to an existing field. |
| 70002277 | EVENT_DEFINITION_EVENT_TIME_FIELD_INVALID                       | An event definition for an event store must have exactly one required event time field.                           | Designate exactly one field as the event time and mark it as required in the schema.                     |
| 70002278 | EVENT_DEFINITION_EVENT_ID_FIELD_INVALID                         | An event definition for an event store must have exactly one event ID field.                                      | Designate exactly one field as the event ID in the schema.                                               |
| 70002279 | EVENT_DEFINITION_EVENT_ID_FIELD_NOT_FOUND_IN_FILE               | The event ID field “\[Field Name]” was not found in the uploaded file.                                            | Ensure the uploaded file contains a column/field matching the event ID field name defined in the schema. |
| 70002280 | MAXIMUM_FILE_SIZE_EXCEEDED                                      | The file exceeds the maximum upload size of \[Maximum File Size]. Please upload a smaller file.                   | Reduce the file size or split it into smaller files.                                                     |