Maxscale does not startup properly due to loading the'maxscaled' protocol

• Referenced Installation Guide Document : https://mariadb.com/kb/en/mariadb-package-repository-setup-and-usage/

• Problem part of MaxScale's configuration file
  -> I can start up MaxScale without this part.

  // Some comments here

  [MaxAdmin]

  type=service

  router=cli

  enable_root_user=1

  [MaxAdmin-Unix-Listener]

  type=listener

  service=MaxAdmin

  protocol=maxscaled

  socket=default

  [MaxAdmin-Inet-Listener]

  type=listener

  service=MaxAdmin

  protocol=maxscaled

  address=localhost

  port=6603

• Starting Error log

  sudo maxscale -d -U maxscale -lstdout

  info : MaxScale will be run in the terminal process.

  2021-01-05 12:27:57 notice : (mxb_log_set_syslog_enabled): syslog logging is enabled.

  2021-01-05 12:27:57 notice : (mxb_log_set_maxlog_enabled): maxlog logging is enabled.

  2021-01-05 12:27:57 notice : (init_sqlite3): The collection of SQLite memory allocation statistics turned off.

  2021-01-05 12:27:57 notice : (init_sqlite3): Threading mode of SQLite set to Multi-thread.

  2021-01-05 12:27:57 notice : (create): Worker message queue size: 1MiB

  2021-01-05 12:27:57.572 notice : (mxb_log_set_highprecision_enabled): highprecision logging is enabled.

  2021-01-05 12:27:57.572 notice : (configure): Using up to 4.67GiB of memory for query classifier cache

  2021-01-05 12:27:57.573 notice : (main): Running OS: Linux@3.10.0-1127.19.1.el7.x86_64, #1 SMP Tue Aug 25 17:23:54 UTC 2020, x86_64 with 4 processor cores.

  2021-01-05 12:27:57.573 notice : (main): Total usable main memory: 31.13GiB.

  2021-01-05 12:27:57.573 notice : (main): MariaDB MaxScale 2.5.6 started (Commit: fddc0526ee79ac9a87f7a7170f3204263240ab57)

  2021-01-05 12:27:57.573 notice : (main): MaxScale is running in process 6105

  Configuration file : /etc/maxscale.cnf

  Log directory : /var/log/maxscale

  Data directory : /var/lib/maxscale

  Module directory : /usr/lib64/maxscale

  Service cache : /var/cache/maxscale

  2021-01-05 12:27:57.573 notice : (main): Configuration file: /etc/maxscale.cnf

  2021-01-05 12:27:57.573 notice : (main): Log directory: /var/log/maxscale

  2021-01-05 12:27:57.573 notice : (main): Data directory: /var/lib/maxscale

  2021-01-05 12:27:57.573 notice : (main): Module directory: /usr/lib64/maxscale

  2021-01-05 12:27:57.573 notice : (main): Service cache: /var/cache/maxscale

  2021-01-05 12:27:57.574 notice : (load_module): Loaded module qc_sqlite: V1.0.0 from /usr/lib64/maxscale/libqc_sqlite.so

  2021-01-05 12:27:57.574 notice : (qc_setup): Query classification results are cached and reused. Memory used per thread: 1.17GiB

  2021-01-05 12:27:57.574 notice : (load_encryption_keys): Password encryption key file '/var/lib/maxscale/.secrets' not found, using configured passwords as plaintext.

  2021-01-05 12:27:57.575 notice : (main): MaxScale started with 4 worker threads, each with a stack size of 8388608 bytes.

  2021-01-05 12:27:57.575 notice : (config_load_single_file): Loading /etc/maxscale.cnf.

  2021-01-05 12:27:57.576 notice : (is_directory): /etc/maxscale.cnf.d does not exist, not reading.

  2021-01-05 12:27:57.576 error : (load_module): Unable to find library for module: maxscaled. Module dir: /usr/lib64/maxscale

  2021-01-05 12:27:57.576 error : (load_module): Unable to find library for module: maxscaled. Module dir: /usr/lib64/maxscale

  2021-01-05 12:27:57.576 notice : (load_module): Loaded module MariaDBClient: V1.1.0 from /usr/lib64/maxscale/libmariadbclient.so

  2021-01-05 12:27:57.576 error : (load_module): Unable to find library for module: cli. Module dir: /usr/lib64/maxscale

  2021-01-05 12:27:57.577 notice : (load_module): Loaded module readwritesplit: V1.1.0 from /usr/lib64/maxscale/libreadwritesplit.so

  2021-01-05 12:27:57.578 notice : (load_module): Loaded module readconnroute: V2.0.0 from /usr/lib64/maxscale/libreadconnroute.so

  2021-01-05 12:27:57.578 notice : (load_module): Loaded module mariadbmon: V1.5.0 from /usr/lib64/maxscale/libmariadbmon.so

  alert : Failed to open, read or process the MaxScale configuration file. See the error log for details.

  2021-01-05 12:27:57.578 alert : (operator()): Failed to open, read or process the MaxScale configuration file /etc/maxscale.cnf.

  2021-01-05 12:27:57.578 notice : (mxs_admin_shutdown): Stopped MaxScale REST API

  2021-01-05 12:27:57.778 notice : (main): MaxScale is shutting down.

  2021-01-05 12:27:57.778 notice : (main): All workers have shut down.

  2021-01-05 12:27:57.778 notice : (main): MaxScale shutdown completed.

Please help me if you guys can.
Thanks in advance.