iercan edited a comment on issue #12867:
URL: https://github.com/apache/superset/issues/12867#issuecomment-771735166
Did you provide a cache service?
For example
```
THUMBNAIL_CACHE_CONFIG: CacheConfig = {
'CACHE_TYPE': 'redis',
'CACHE_DEFAULT_TIMEOUT': 24*60*60*7,
'CACHE_KEY_PREFIX': 'thumbnail_',
'CACHE_NO_NULL_WARNING': True,
'CACHE_REDIS_URL': 'redis://redis:6379/1'
}
```
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