unload voice

i get the following:
Traceback (most recent call last):
File "C:\RVC20260718Nvidia50x0\runtime\Lib\site-packages\gradio\routes.py", line 321, in run_predict
output = await app.blocks.process_api(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\RVC20260718Nvidia50x0\runtime\Lib\site-packages\gradio\blocks.py", line 1006, in process_api
result = await self.call_function(fn_index, inputs, iterator, request)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\RVC20260718Nvidia50x0\runtime\Lib\site-packages\gradio\blocks.py", line 847, in call_function
prediction = await anyio.to_thread.run_sync(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\RVC20260718Nvidia50x0\runtime\Lib\site-packages\anyio\to_thread.py", line 33, in run_sync
return await get_asynclib().run_sync_in_worker_thread(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\RVC20260718Nvidia50x0\runtime\Lib\site-packages\anyio_backends_asyncio.py", line 877, in run_sync_in_worker_thread
return await future
^^^^^^^^^^^^
File "C:\RVC20260718Nvidia50x0\runtime\Lib\site-packages\anyio_backends_asyncio.py", line 807, in run
result = context.run(func, *args)
^^^^^^^^^^^^^^^^^^^^^^^^
File "C:\RVC20260718Nvidia50x0\infer\vc\modules.py", line 124, in get_vc
clear_cuda_graph_cache(self.net_g)
^^^^^^^^^^
AttributeError: 'VC' object has no attribute 'net_g'

Start in infer/vc/modules.py at get_vc around line 124 and reproduce the unload-voice action that raises the shown AttributeError. Trace the VC initialization and unload paths, then verify that unloading a voice completes without this exception.