Pixel clustering with Pixie - error

[Nitya20001]

Describe the bug
Not sure if this is a bug: This is my first time running the pixie notebook. I added my tiff files for each channel, the deep cell segmentation output, etc in the data folder that was created when I downloaded the ark analysis package.

However, when I run the function below to create the pixel SOM weights:

pixel_pysom = pixel_som_clustering.train_pixel_som(
fovs,
channels,
base_dir,
subset_dir=pixel_subset_dir,
norm_vals_name=norm_vals_name,
som_weights_name=pixel_som_weights_name,
num_passes=1,
seed=42
)

I get this error:

The file/path, channel_norm_post_rownorm.feather, could not be found..

Please help!