Product Category won't show in Purchasing

[mahija (mahi)]

I installed gnuhealth and try to make a quotation, when i want to add the line> add product> add product template: it shows several fields including categories. I can’t seem to see this column:

after i clicked okay it shows something liike this:

Traceback (most recent call last):
  File "/trytond/wsgi.py", line 117, in dispatch_request
    return endpoint(request, **request.view_args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/protocols/dispatcher.py", line 46, in rpc
    return methods.get(request.rpc_method, _dispatch)(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/wsgi.py", line 84, in auth_required
    return wrapped(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/protocols/wrappers.py", line 181, in wrapper
    return func(request, pool, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/protocols/dispatcher.py", line 180, in _dispatch
    result = rpc.result(meth(*c_args, **c_kwargs))
                        ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/modules/product/product.py", line 565, in create
    products = super().create(vlist)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/model/modelsql.py", line 159, in wrapper
    return func(cls, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/trytond/model/modelsql.py", line 668, in create
    field.set(cls, fname, *fargs)
  File "/trytond/model/fields/function.py", line 123, in set
    raise NotImplementedError(gettext(
NotImplementedError: Missing setter function for field "Categories" in "Product Variant".

Perhaps anyone understand what should I do about this, I am a bit confused. What does Missing setter function for field "Categories" in "Product Variant" mean? Was it about relational table?

[ced (Cédric Krier)]

You seem to use a very old web client (it does not have the theme from 2020).
Normally you should not be allowed (by the UI) to set categories on product variant but only on product template.