Layer error: Image.constant: Parameter 'value' is required.

[muddasirshah]

Hi Sam,
Thank you for providing amazing repo for image calibration in GEE. All was good till now but with reduced image collections i.e. mean median or mosaic image, google earth engine shows this error.
"Layer error: Image.constant: Parameter 'value' is required."

It only works with a single image which is filtered by ID or .first() method, not the mean median or mosaic image. :(

Please check this out
https://code.earthengine.google.com/e74efdb28503f7d942d90d831c337e28