NotImplementedError: Cannot convert a symbolic Tensor (detector/yolo-v3/meshgrid/Size_1:0) to a numpy array.

[Pratyaksha-047]

When running this line to convert yolov3 custom model to .pb format:
!python convert_weights_pb.py --class_names "classes.txt" --weights_file "yolov3_training_last.weights" --data_format "NHWC"

I am getting the above error. I am running this code in google colab

[GuoZhiyong]

numpy version is too high

try python3.7 protobuf 3.19 numpy 1.19.2