How do I fix this error?

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Python

I have a code that takes data in .txt format and converts it to .ply format, after that it performs some operations on it. when I run the code it shows me the given error! please help me fix that error.
the code:

def convert_pc2ply(anno_path, save_path):
 
    data_list = []
    for f in glob.glob(join(anno_path, '*.txt')):
         class_name = os.path.basename(f).split('_')[0]
         if class_name not in gt_class: 
           class_name = 'clutter'
         pc = pd.read_csv(f, header=None, delim_whitespace=True).values
         labels = np.ones((pc.shape[0], 1)) * gt_class2label[class_name]
         data_list.append(np.concatenate([pc, labels], axis=1))  # Nx7

    pc_label = np.concatenate((data_list, [0]))
    xyz_min = np.amin(pc_label, axis=0)[0:3]
    pc_label[:, 0:3] -= xyz_min
    xyz = pc_label[:, :3].astype(np.float32)
    colors = pc_label[:, 3:6].astype(np.uint8)
    labels = pc_label[:, 6].astype(np.uint8)
    write_ply(save_path, (xyz, colors, labels), ['x', 'y', 'z', 'red', 'green', 'blue', 'class'])

the error:

<pre>Traceback (most recent call last):
  File "data_prepare.py", line 78, in <module>
    convert_pc2ply(annotation_path, join(original_pc_folder, out_file_name))
  File "data_prepare.py", line 48, in convert_pc2ply
    xyz_min = np.amin(pc_label, axis=0)[0:3]
  File "<__array_function__ internals>", line 6, in amin
  File "/home/youssefhany/miniconda3/envs/randlanet/lib/python3.5/site-packages/numpy/core/fromnumeric.py", line 2793, in amin
    keepdims=keepdims, initial=initial, where=where)
  File "/home/youssefhany/miniconda3/envs/randlanet/lib/python3.5/site-packages/numpy/core/fromnumeric.py", line 90, in _wrapreduction
    return ufunc.reduce(obj, axis, dtype, out, **passkwargs)
ValueError: operands could not be broadcast together with shapes (61528,7) (19727,7)

What I have tried:

I don't understand the error or where it came from to try!