[Python] Converting 2d tiff into 3d tif files - stack error

I'm working in WSL Ubuntu, writing this script in SPAM Jupyter Lab. I want to convert my 2d TIFF files into a 3d TIFF file. After stating the directory where the 2d TIFF files are, this is my code:

files = sorted([f for f in os.listdir(folder) if f.endswith(".tiff")])
files = sorted([f for f in os.listdir(folder) if f.endswith(".tiff")])
stack = []
for fname in files:
img = tifffile.imread(os.path.join(folder, fname))
stack.append(img)

volume = np.stack(stack, axis=0)


I get an error message: need at least one array to stack. I don't know how to correct it. Can you please help?

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