IndexError: index -1 is out of bounds for axis 0 with size 0

I've been trying to set this up for a little while now, and have not managed to do it.
I got a trained model from a friend, (which works in the live-gui mode, and also performs excellent on his computer).

From what i have gathered is the AttributeError: 'NoneType' object has no attribute 'dtype' error, just there because it doesn't get the data it needs, so that's not the troublemaker.

I can't explain the error before it though:

Traceback (most recent call last):
  File "D:\RVC-beta-v2-0618\infer-web.py", line 201, in vc_single
    audio_opt = vc.pipeline(
  File "D:\RVC-beta-v2-0618\vc_infer_pipeline.py", line 349, in pipeline
    self.vc(
  File "D:\RVC-beta-v2-0618\vc_infer_pipeline.py", line 204, in vc
    npy = np.sum(big_npy[ix] * np.expand_dims(weight, axis=2), axis=1)
IndexError: index -1 is out of bounds for axis 0 with size 0

I have tried all the steps outlined in other issue-threads, but nothing seems to work.
If I'm missing something blatantly obvious, please tell me.

Thanks in advance

Start with the traceback in vc_infer_pipeline.py around line 204 and inspect how the trained model and input data reach vc.pipeline from infer-web.py. Reproduce the reported IndexError with the supplied setup, then identify what empty input causes it and verify that the inference path completes without the error.