What error is this?

[r18novel]

--------------Environment--------------
DeepMosaics: 0.5.1
Python: 3.7.3 (default, Apr 24 2019, 15:29:51) [MSC v.1915 64 bit (AMD64)]
Pytorch: 1.7.1
OpenCV: 4.1.2
Platform: Windows-10-10.0.19041-SP0
--------------BUG--------------
Error Type: <class 'IndexError'>
index 0 is out of bounds for axis 0 with size 0
<FrameSummary file deepmosaic.py, line 77 in >
<FrameSummary file deepmosaic.py, line 51 in main>
<FrameSummary file cores\clean.py, line 198 in cleanmosaic_video_fusion>
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