How to resolve "TypeError: unsupported operand type(s) for /: 'int' and
'NoneType'",
list info:
[root@beTrac besite_mysql]# trac-admin /var/www/trac/besite_mysql initenv

database connect string [sqlite:db/trac.db]> mysql://trac:tracbe@localhost
:3306/besite

create and initlize
'/var/www/trac/besite_mysql' execute initenv fail。
create fail。
unsupported operand type(s) for /: 'int' and 'NoneType'
Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/trac/admin/console.py", line 437, in
do_initenv
    options=options)
  File "build/bdist.linux-x86_64/egg/trac/env.py", line 214, in __init__
    self.create(options)
  File "build/bdist.linux-x86_64/egg/trac/env.py", line 402, in create
    DatabaseManager(self).init_db()
  File "build/bdist.linux-x86_64/egg/trac/db/api.py", line 146, in init_db
    connector.init_db(**args)
  File "build/bdist.linux-x86_64/egg/trac/db/mysql_backend.py", line 106,
in init_db
    for stmt in self.to_sql(table, utf8_size=utf8_size):
  File "build/bdist.linux-x86_64/egg/trac/db/mysql_backend.py", line 155,
in to_sql
    utf8_size=utf8_size))
  File "build/bdist.linux-x86_64/egg/trac/db/mysql_backend.py", line 119,
in _collist
    limit_col = 767 / utf8_size
TypeError: unsupported operand type(s) for /: 'int' and 'NoneType'

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