cdmikechen commented on issue #10530:
URL: https://github.com/apache/superset/issues/10530#issuecomment-764388393
@bkyryliuk If I use
```
FEATURE_FLAGS = {
"THUMBNAILS": True
}
```
superset will report error:
```
[2021-01-21 13:30:47,554: INFO/ForkPoolWorker-1] Processing url for
thumbnail: 85e35616c1758c065a4fc7445f084f9a
Init selenium driver
[2021-01-21 13:30:47,555: INFO/ForkPoolWorker-1] Init selenium driver
Failed at generating thumbnail Instance <User at 0x112e39250> is not bound
to a Session; attribute refresh operation cannot proceed (Background on this
error at: http://sqlalche.me/e/13/bhk3)
[2021-01-21 13:30:55,431: ERROR/ForkPoolWorker-1] Failed at generating
thumbnail Instance <User at 0x112e39250> is not bound to a Session; attribute
refresh operation cannot proceed (Background on this error at:
http://sqlalche.me/e/13/bhk3)
```
Is this problem related to this PR
https://github.com/apache/superset/pull/10819 ?
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