Hello odoo-ers all around the world,

My question is, what is the reason behind the error as follows:

2024-08-05 09:30:11 Traceback (most recent call last):

2024-08-05 09:30:11   File "/usr/lib/python3/dist-packages/odoo/tools/cache.py", line 99, in lookup

2024-08-05 09:30:11     r = d[key]

2024-08-05 09:30:11   File "", line 2, in __getitem__

2024-08-05 09:30:11   File "/usr/lib/python3/dist-packages/odoo/tools/func.py", line 87, in locked

2024-08-05 09:30:11     return func(inst, *args, **kwargs)

2024-08-05 09:30:11   File "/usr/lib/python3/dist-packages/odoo/tools/lru.py", line 34, in __getitem__

2024-08-05 09:30:11     a = self.d[obj]

2024-08-05 09:30:11 KeyError: ('purchase.order', , (970, 'tree', None, 'en_US', uom.uom(3,)))

I got this in log when I am using def _get_view(...) overloading method in my inherited Purchase Order model,

here's my complete '_get_view' code:
@api.model     def _get_view(self, view_id=None, view_type='form', **options):          arch, view = super()._get_view(view_id, view_type, **options)

          # Simulate context for testing purposes          simulated_context = {               'active_model': self._name,  # Replace with actual model name               'active_id': self._origin.id,  # Replace with actual record ID               # Add other missing context keys as needed          }          context = dict(self._context, **simulated_context)          _logger.exception("GET VIEW: CONTEXT ??? >>>>> %s", (context))

          # Rest of your code          # context = self._context          active_id = self.env.context.get('active_id')

          # _logger.exception("ACTIVE ID: ??? >>>>> %s", (self._origin.id if not active_id else active_id))

          if view_type == 'form' and context:               # _logger.exception(               #      "VIEW TYPE and CONTEXT and OPTIONS: ??? >>>>> %s - %s - %s",               #      (view_type, context, options)               # )

               if context.get('params'):                    if context['params'].get('id'):                         params_id = context['params']['id']                         purchase_id = self.env[self._name].browse(params_id)

                         for node in arch.xpath("//button[@name='button_approval']"):                              # _logger.exception("ARCH.XPATH: ??? >>>>> %s %s", (arch, view))                              node.attrib['string'] = fields.Datetime.now().strftime("%d-%b-%y %H:%M:%S")

          return arch, view 

what did I do wrong? furthermore, how to solve it?
Thanks in advance