SEN ET Sentinel3 Pre Processing Graph error

Hello, I’m using SNAP 7 and Python 3.6.3 for Sen ET, and trying to estimate ET for 2018, 2019 and 2020. The S3 image for 2020 is available as small tiles hence I was successful to complete for 2020. But 2018 and 2019 images are available as swath. When I try to run the pre processing graph, after few minutes the following error pops up.

Please help me with possible solutions.
Thank you.

A search of this forum should get Error message showing “cannot construct data Buffer” where your question may have been answered.