I already did an update for 1.4.0 with my mod (not the one in this thread) .... it *should* work with 1.4.1, as the only time you need to update these is when new fish are added and AFAIK, 1.4.1 did not add any new fish. https://community.playstarbound.com/resources/easier-fishing-standalone-1-3-1-4-beta.4226/
Are you using the English version? The mod specifically says it only works on the English version of the game. I just looked just now, and I don't see any reason why it should be crashing. You're sure you downloaded the latest version (use the one from the 1.4BETA folder)? And you were fishing at the Beach? What season? EDIT: looking at Wiki, the only new fish at the Beach is the Flounder, and I loaded up my save, with the mod as it is on the repository and went there, and fished up a Flounder with no problems. Do you have any other mods/etc maybe?
any plans to update this for the 1.5 version, which included new fish and new legendary fish? This is honestly my must have mod due to medical conditions that are aggravated by the fishing minigame. it doesn't remove the challenge, but makes it less likely to cause my hands to seize up.
I updated it earlier. You might want to bookmark/subscribe to this one: https://community.playstarbound.com/resources/easier-fishing-standalone-1-4-beta-1-5.4226/