Redis ERR Protocol error

Protocol error, such as an invalid command format, occurred.
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What is

Redis ERR Protocol error

 ?
  1. Check Redis server logs for errors: tail -f /var/log/redis/redis-server.log
  2. Verify Redis server is running: redis-cli ping (Expect a PONG response)
  3. Check for memory usage: redis-cli info memory
  4. Review client connections: redis-cli client list
  5. Monitor commands and errors in real-time: redis-cli monitor
  6. Check disk space where Redis data is stored: df -h
  7. Test network connectivity to Redis server: ping <redis-server-ip>
  8. Examine configuration file for anomalies: cat /etc/redis/redis.conf
Attached error: 
Redis ERR Protocol error
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