please understand that we cannot easily know the problem by looking at these outputs. There can be many reasons why the script does not find the data in the given folder. But we need more information to help you.
Your screenshots above indicate that the data exported from SNAP lies in
/home/endashaw/INSAR_master_date
if dem, diff0, geo, rslc are inside this folder, the script should be able to run.
Do they contain the data as required? An example is given here: Workflow between SNAP and StaMPS