Reading from redis server into logstash input

Hi, I am new to logstash. How can I read values which are saved in redis-server under the key ":1:logstash"? if the type of ":1:logstash" is string.. I have an input setting like this:

redis {
host => "some_redis_server"
key => ":1:logstash"
data_type => "list"
codec => json
type => "redis"
tags => ["redis"]

and when I run logstash it gives me an error: [logstash.inputs.redis ] Redis connection problem {:exception=>#<Redis::CommandError: ERR Error running script (call to some_value): @user_script:2: WRONGTYPE Operation against a key holding the wrong kind of value>}

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