error odoo jsonrpc

---------------------------------------------------------------------------
ServerError                               Traceback (most recent call last)
<ipython-input-2-9c9816d51836> in <module>
----> 1 env['ir.model'].search_read([])

~\Anaconda3\lib\site-packages\odooly.py in wrapper(self, *params, **kwargs)
   1364         def wrapper(self, *params, **kwargs):
   1365             """Wrapper for client.execute(%r, %r, *params, **kwargs)."""
-> 1366             return self._execute(attr, *params, **kwargs)
   1367         return _memoize(self, attr, wrapper, (self._name, attr))
   1368 

~\Anaconda3\lib\site-packages\odooly.py in execute(self, obj, method, *params, **kwargs)
    735         kw = ((dict(kwargs, context=self.context),)
    736               if self.context else (kwargs and (kwargs,) or ()))
--> 737         res = self._execute_kw(obj, method, params, *kw)
    738         if ordered:
    739             # The results are not in the same order as the ids

~\Anaconda3\lib\site-packages\odooly.py in <lambda>(s, *args)
    456                 return res
    457         else:
--> 458             wrapper = lambda s, *args: s._dispatch(name, args)
    459         return _memoize(self, name, wrapper)
    460 

~\Anaconda3\lib\site-packages\odooly.py in dispatch_jsonrpc(url, service_name, method, args)
    383     resp = http_post(url, json.dumps(data).encode('ascii'))
    384     if resp.get('error'):
--> 385         raise ServerError(resp['error'])
    386     return resp['result']
    387 

ServerError: 
{'data': {'name': 'builtins.KeyError', 'message': 'ir.qweb.widget', 'exception_type': 'internal_error', 'arguments': ['ir.qweb.widget'], 'debug': 
    'Traceback (most recent call last):  
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/fields.py", line 949, in __get__
    value = record.env.cache.get(record, self)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/api.py", line 977, in get
    value = self._data[key][field][record._ids[0]]
    KeyError: 720

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 653, in _handle_exception
    return super(JsonRequest, self)._handle_exception(exception)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 312, in _handle_exception
    raise pycompat.reraise(type(exception), exception, sys.exc_info()[2])
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/tools/pycompat.py", line 87, in reraise
    raise value
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 695, in dispatch
    result = self._call_function(**self.params)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 344, in _call_function
    return checked_call(self.db, *args, **kwargs)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 337, in checked_call
    result = self.endpoint(*a, **kw)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 939, in __call__
    return self.method(*args, **kw)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 517, in response_wrap
    response = f(*args, **kw)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 1665, in jsonrpc
    return dispatch_rpc(service, method, args)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/http.py", line 118, in dispatch_rpc
    result = dispatch(method, params)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/service/model.py", line 39, in dispatch
    res = fn(db, uid, *params)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/service/model.py", line 172, in execute_kw
    return execute(db, uid, obj, method, *args, **kw or {})
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/service/model.py", line 97, in wrapper
    return f(dbname, *args, **kwargs)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/service/model.py", line 179, in execute
    res = execute_cr(cr, uid, obj, method, *args, **kw)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/service/model.py", line 168, in execute_cr
    return odoo.api.call_kw(recs, method, args, kw)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/api.py", line 697, in call_kw
    return call_kw_model(method, model, args, kwargs)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/api.py", line 682, in call_kw_model
    result = method(recs, *args, **kwargs)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/models.py", line 4305, in search_read
    result = records.read(fields)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/models.py", line 2636, in read
    vals[name] = convert(record[name], record, use_name_get)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/models.py", line 4832, in __getitem__
    return self._fields[key].__get__(self, type(self))
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/fields.py", line 953, in __get__
    self.determine_value(record)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/fields.py", line 1066, in determine_value
    self.compute_value(recs)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/fields.py", line 1020, in compute_value
    self._compute_value(records)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/fields.py", line 1011, in _compute_value
    getattr(records, self.compute)()
    File "/home/odoo/src/odoo/odoo/addons/base/ir/ir_model.py", line 123, in _compute_count
    records = self.env[model.model]
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/api.py", line 771, in __getitem__
    return self.registry[model_name]._browse((), self)
    File "/home/odoo/.local/lib/python3.5/site-packages/odoo/modules/registry.py", line 179, in __getitem__
    return self.models[model_name]
    KeyError: \'ir.qweb.widget\'
    '
}, 
'message': 'Odoo Server Error', 'code': 200}