krasmussen37 commented on issue #34338:
URL: https://github.com/apache/superset/issues/34338#issuecomment-3156529374

   Looking at our git history, we **did** previously have `RESULTS_BACKEND` set 
to a dict, which       
     would have caused exactly the error you're describing:
   
     ```python
     # Previous configuration (from git history):
     RESULTS_BACKEND = {
         'cache_type': 'redis',
         'cache_redis_host': REDIS_HOST,
         'cache_redis_port': REDIS_PORT,
         'cache_redis_db': REDIS_DB,
     }
   
     We fixed this by changing to the proper cachelib object:
   
     # Current configuration:
     from cachelib.redis import RedisCache
     RESULTS_BACKEND = RedisCache(
         host=REDIS_HOST,
         port=int(REDIS_PORT),
         db=int(REDIS_DB),
         key_prefix='superset_results_'
     )
   
     So yes, we likely encountered the "'dict' object has no attribute 'set'" 
error during development and fixed it by switching from the dict      
     configuration to the proper RedisCache object.


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