Travis failure on upgrading liquidate - core

Hello members,
I am working on this ticket of which I managed to make a PR on this link though having a Travis failure. I have tried to upgrade liquidate to 3.5.x version and a above and even below 3.5.x but am getting the same error log when I upgrade it from version 3.0.0 - 3.8.4 as reflected on this paste bin link even after ensuring the liquidate extensions are up to date. What could be the problem?