@shreya_patel I would like to share my similar experience with this. It seems to me that new MongoDB clusters now come with sample_mflix by default. However, since this same sample dataset is also included in the 350mb sample data, the namespace conflict happens since sample_mflix already exists. Strangely I have seen via team members that they had a different UI: a dropdown menu where the option was given to choose via checklist which sample data to install. In their case the bug was avoided. However as of today the option remains in my account to install the full 350mb set, and thus the error also persists. I wish you would give everyone the dropdown do avoid this headache.