Please help me,problems in model transformation using Tengine SDK

Hello, I am following 如何使用Tengine SDK | Khadas Documentation. During the conversion operation , I also prepared 100 pictures for quantization and named them quant1, quant2,…, quant100,then I stored them in the quant folder. But what’s the reason for the situation in the screenshot after inputting the instructions?

Yolov3 model training should be OK, and the test results of the model on PC ubuntu18.04 are successful. It is that the above problems occurred when following the instructions.