Error:
Odoo Server Error

Traceback (most recent call last):
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 631, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 325, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
  File "C:\Users\Odoo\repo\odoo-dev\odoo\tools\pycompat.py", line 14, in reraise
    raise value
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 676, in dispatch
    result = self._call_function(**self.params)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 357, in _call_function
    return checked_call(self.db, *args, **kwargs)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\service\model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 350, in checked_call
    result = self.endpoint(*a, **kw)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 894, in __call__
    return self.method(*args, **kw)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\http.py", line 522, in response_wrap
    response = f(*args, **kw)
  File "c:\users\odoo\repo\odoo-dev\addons\web\controllers\main.py", line 948, in call_kw
    return self._call_kw(model, method, args, kwargs)
  File "c:\users\odoo\repo\odoo-dev\addons\web\controllers\main.py", line 940, in _call_kw
    return call_kw(request.env[model], method, args, kwargs)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\api.py", line 696, in call_kw
    return _call_kw_multi(method, model, args, kwargs)
  File "C:\Users\Odoo\repo\odoo-dev\odoo\api.py", line 683, in _call_kw_multi
    result = method(recs, *args, **kwargs)
  File "c:\users\odoo\repo\enterprise-dev\account_reports\models\account_report.py", line 1164, in get_report_informations
    'main_html': self.get_html(options),
  File "c:\users\odoo\repo\enterprise-dev\account_reports\models\account_report.py", line 1204, in get_html
    lines = self._get_lines(options, line_id=line_id)
  File "c:\users\odoo\repo\enterprise-dev\account_reports\models\account_report_coa.py", line 131, in _get_lines
    'columns': [{'name': self.format_value(total), 'class': 'number'} for total in totals],
TypeError: 'NoneType' object is not iterable