# Miscellaneous Solutions & Notes

## Error messages

### 500s loading /admin/instances

From s0 on Server & Upgrading chat, 2023-02-17: 

#### Error

```
ActiveRecord::StatementInvalid: PG::ObjectNotInPrerequisiteState: ERROR:  materialized view "instances" has not been populated HINT:  Use the REFRESH MATERIALIZED VIEW command.
```

#### Solution

Went into postgres on mastodon_production and ran refresh materialized view instances