kenho811 commented on issue #20838:
URL: https://github.com/apache/superset/issues/20838#issuecomment-1242993442

   The below comment solved my problem.
   
   https://github.com/apache/superset/issues/13275#issuecomment-864205737
   
   ======
   
   In short, my config file had the below line
   
   ```
   RESULTS_BACKEND = {
       "CACHE_TYPE": "SimpleCache",
       "CACHE_DIR": Path(__file__).parent.joinpath('cache'),
       "CACHE_KEY_PREFIX": "results_backend",  # make sure this string is 
unique to avoid collisions
       "CACHE_DEFAULT_TIMEOUT": 86400,  # 60 seconds * 60 minutes * 24 hours
   }
   ```
   The above is wrong, because `RESULTS_BACKEND` does NOT expect a python 
dictionary.l
   
   After changing the above to
   
   
   
   ```
   
   RESULTS_BACKEND = RedisCache(
       host="localhost",
       port=6379,
       key_prefix="superset_results",
       default_timeout= 86400,  # 60 seconds * 60 minutes * 24 hours
   )
   ```
   
   
   The issue is resolved.
   
   


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