Currently i installed this module " website_theme_flexible-11.0.1.0.1 " but it not installed as it not compatible with version 13, but after that i couldn't access the setting app and always pop up an error: 

Error:
Odoo Server Error

Traceback (most recent call last):
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 619, in _handle_exception
return super(JsonRequest, self)._handle_exception(exception)
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 309, in _handle_exception
raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
File "/home/odoo/src/odoo/13.0/odoo/tools/pycompat.py", line 14, in reraise
raise value
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 664, in dispatch
result = self._call_function(**self.params)
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 345, in _call_function
return checked_call(self.db, *args, **kwargs)
File "/home/odoo/src/odoo/13.0/odoo/service/model.py", line 93, in wrapper
return f(dbname, *args, **kwargs)
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 338, in checked_call
result = self.endpoint(*a, **kw)
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 909, in __call__
return self.method(*args, **kw)
File "/home/odoo/src/odoo/13.0/odoo/http.py", line 510, in response_wrap
response = f(*args, **kw)
File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1319, in call_kw
return self._call_kw(model, method, args, kwargs)
File "/home/odoo/src/odoo/13.0/addons/web/controllers/main.py", line 1311, in _call_kw
return call_kw(request.env[model], method, args, kwargs)
File "/home/odoo/src/odoo/13.0/odoo/api.py", line 391, in call_kw
result = _call_kw_model(method, model, args, kwargs)
File "/home/odoo/src/odoo/13.0/odoo/api.py", line 364, in _call_kw_model
result = method(recs, *args, **kwargs)
File "/home/odoo/src/odoo/13.0/odoo/models.py", line 1432, in load_views
for [v_id, v_type] in views
File "/home/odoo/src/odoo/13.0/odoo/models.py", line 1432, in <dictcomp>
for [v_id, v_type] in views
File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/res_config.py", line 386, in fields_view_get
toolbar=toolbar, submenu=submenu)
File "/home/odoo/src/odoo/13.0/addons/web/models/models.py", line 203, in fields_view_get
r = super().fields_view_get(view_id, view_type, toolbar, submenu)
File "/home/odoo/src/odoo/13.0/odoo/models.py", line 1519, in fields_view_get
xarch, xfields = View.postprocess_and_fields(self._name, etree.fromstring(result['arch']), view_id)
File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/ir_ui_view.py", line 964, in postprocess_and_fields
self.raise_view_error(message, view_id)
File "/home/odoo/src/odoo/13.0/odoo/addons/base/models/ir_ui_view.py", line 592, in raise_view_error
raise ValueError(message)
ValueError: Field `google_font_api_key` does not exist

Error context:
View `n/a`
[view_id: n/a, xml_id: n/a, model: n/a, parent_id: n/a]