The last person who tried to help me suggested that I check to make sure I have MariaDB installed.

I ran the version command, and this is what I get:
mysql --version
mysql Ver 15.1 Distrib 10.1.48-MariaDB, for debian-linux-gnu (x86_64) using readline 5.2

When I run sudo systemctl status mariadb, I get:
● mariadb.service - MariaDB 10.1.48 database server
Loaded: loaded (/lib/systemd/system/mariadb.service; enabled; vendor preset:
Active: active (running) since Tue 2022-07-05 10:05:59 MST; 24h ago
Docs: man:mysqld(8)
https://mariadb.com/kb/en/library/systemd/
Main PID: 7442 (mysqld)
Status: "Taking your SQL requests now..."
Tasks: 27 (limit: 4915)
CGroup: /system.slice/mariadb.service
└─7442 /usr/sbin/mysqld

Jul 05 10:05:58 fred systemd[1]: Starting MariaDB 10.1.48 database server...
Jul 05 10:05:59 fred mysqld[7442]: 2022-07-05 10:05:59 140134039297152 [Note] /u
Jul 05 10:05:59 fred systemd[1]: Started MariaDB 10.1.48 database server.

It SEEMS that MariaDB is running okay. But CQRlog fails out whenever I try to start it. Here are the last lines of the mysql.err log. I have no idea what to do now. Can anyone help me with this?

2022-07-06 10:24:24 140210839125120 [Note] InnoDB: innodb_empty_free_list_algorithm has been changed to legacy because of small buffer pool size. In order to use backoff, increase buffer pool at least up to 20MB.

2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Using mutexes to ref count buffer pool pages
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: The InnoDB memory heap is disabled
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: GCC builtin __atomic_thread_fence() is used for memory barrier
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Compressed tables use zlib 1.2.11
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Using Linux native AIO
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Using SSE crc32 instructions
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Initializing buffer pool, size = 80.0M
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Completed initialization of buffer pool
2022-07-06 10:24:24 140210839125120 [Note] InnoDB: Highest supported file format is Barracuda.
InnoDB: No valid checkpoint found.
InnoDB: A downgrade from MariaDB 10.2.2 or later is not supported.
InnoDB: If this error appears when you are creating an InnoDB database,
InnoDB: the problem may be that during an earlier attempt you managed
InnoDB: to create the InnoDB data files, but log file creation failed.
InnoDB: If that is the case, please refer to
InnoDB: http://dev.mysql.com/doc/refman/5.6/en/error-creating-innodb.html
2022-07-06 10:24:24 140210839125120 [ERROR] Plugin 'InnoDB' init function returned error.
2022-07-06 10:24:24 140210839125120 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed.
2022-07-06 10:24:24 140210839125120 [Note] Plugin 'FEEDBACK' is disabled.
2022-07-06 10:24:24 140210839125120 [ERROR] Unknown/unsupported storage engine: innodb
2022-07-06 10:24:24 140210839125120 [ERROR] Aborting

I tried looking at the web site (dev.mysql.com...) listed in the error file, but I can't figure out what they are talking about. Any help would be greatly appreciated as I'd really like to get CQRLOG working again. Thanks~