"Redis" Wrongtype operation against a key holding

An issue occurred when inserting data using Jedis:
Redis.clients.jedis.exceptions.JedisDataException:WRONGTYPE operation against a key holding the wrong kind of value

The code is probably implemented like this:

hashmap<string,string> map = new hashmap<string,string> ();  
Map.put ("Mapkey", "20145");   
Jedis.hmset ("key", map);  

There seems to be no value type that looks wrong. It turns out that the same key already exists in the Redis database, and that the value type for the key is not hashmap; When you call Hmset, this error is thrown.
Clear out the original data and run it again.