Opening singleton with URL pointing to id 1 failed
Here is the traceback when opening https://demo.tryton.org/model/purchase.configuration/1:
Traceback (most recent call last):
File "/usr/local/lib/python37/dist-packages/trytond/wsgipy", line 116, in dispatch_request
return endpoint(request, **requestview_args)
File "/usr/local/lib/python37/dist-packages/trytond/protocols/dispatcherpy", line 48, in rpc
request, database_name, *requestrpc_params)
File "/usr/local/lib/python37/dist-packages/trytond/wsgipy", line 83, in auth_required
return wrapped(*args, **kwargs)
File "/usr/local/lib/python37/dist-packages/trytond/protocols/wrapperspy", line 131, in wrapper
return func(request, pool, *args, **kwargs)
File "/usr/local/lib/python37/dist-packages/trytond/protocols/dispatcherpy", line 181, in _dispatch
result = rpcresult(meth(*c_args, **c_kwargs))
File "/usr/local/lib/python37/dist-packages/trytond/model/modelsingletonpy", line 42, in read
with_rec_name=len(fname_no_rec_name) != len(fields_names))
File "/usr/local/lib/python37/dist-packages/trytond/model/modelsingletonpy", line 102, in default_get
with_rec_name=with_rec_name)
File "/usr/local/lib/python37/dist-packages/trytond/model/modelpy", line 149, in default_get
field = cls_fields[field_name]
KeyError: '_write'