Failed to load application: name '_mysql' is not defined

Hi Juce, I'm trying to do a fresh install on a raspi3b+ running debian bullseye. Have been able to install all the requirements and create database but running ./servicve.sh sixserver start returns:
pi@raspberrypi:/fiveserver $ sudo mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 52
Server version: 10.0.28-MariaDB-2+b1 Raspbian testing-staging

Copyright (c) 2000, 2016, Oracle, MariaDB Corporation Ab and others.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

MariaDB [(none)]> create database fiveserver;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> create database sixserver;
Query OK, 1 row affected (0.00 sec)

MariaDB [(none)]> create user 'sixserver'@'%' identified by 'proevo';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> grant select, insert, update on sixserver.* to 'sixserver'@'%';
Query OK, 0 rows affected (0.00 sec)

MariaDB [(none)]> use sixserver;
Database changed
MariaDB [sixserver]> source ./sql/schema6.sql
Query OK, 0 rows affected (0.28 sec)

Query OK, 0 rows affected (3.68 sec)

Query OK, 0 rows affected (0.23 sec)

Query OK, 0 rows affected (0.10 sec)

Query OK, 0 rows affected (0.11 sec)

Query OK, 0 rows affected (0.11 sec)

Query OK, 0 rows affected (0.11 sec)

Query OK, 0 rows affected (0.11 sec)

MariaDB [sixserver]> exit
Bye
pi@raspberrypi:/fiveserver $ ./service.sh sixserver start
Unhandled Error
Traceback (most recent call last):
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/application/app.py", line 676, in run
    runApp(config)
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/scripts/twistd.py", line 30, in runApp
    runner.run()
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/application/app.py", line 372, in run
    self.application = self.createOrGetApplication()
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/application/app.py", line 439, in createOrGetApplication
    application = getApplication(self.config, passphrase)
--- <exception caught here> ---
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/application/app.py", line 448, in getApplication
    application = service.loadApplication(filename, style, passphrase)
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/application/service.py", line 404, in loadApplication
    application = sob.loadValueFromFile(filename, "application")
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/persisted/sob.py", line 176, in loadValueFromFile
    eval(codeObj, d, d)
  File "./tac/sixserver.tac", line 29, in <module>
    dbConfig.getReadPool(), dbConfig.getWritePool())
  File "/fiveserver/lib/fiveserver/config.py", line 125, in getReadPool
    self._readPool = self.getWritePool()
  File "/fiveserver/lib/fiveserver/config.py", line 137, in getWritePool
    self._writePool = storagecontroller.getDbPool(self.readServers,
  File "/fiveserver/lib/fiveserver/storagecontroller.py", line 20, in getDbPool
    return [
  File "/fiveserver/lib/fiveserver/storagecontroller.py", line 21, in <listcomp>
    adbapi.ConnectionPool("MySQLdb", db=db,
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/enterprise/adbapi.py", line 201, in __init__
    self.dbapi = reflect.namedModule(dbapiName)
  File "/fiveserver/.local/lib/python3.9/site-packages/twisted/python/reflect.py", line 157, in namedModule
    topLevel = __import__(name)
  File "/fiveserver/.local/lib/python3.9/site-packages/MySQLdb/__init__.py", line 24, in <module>
    version_info, _mysql.version_info, _mysql.__file__
builtins.NameError: name '_mysql' is not defined

Failed to load application: name '_mysql' is not defined
Do you have any ideas what might have gone wrong?
juce / fiveserver

Failed to load application: name '_mysql' is not defined #14
