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Since the source was included I fixed it, it appears that the code samples a random body of water, so if you have mixed water like I do, both fresh and salt (ocean), it will only work for one, so in your settings set unknown to the one that doesn't work and you can continue to use the mod as expected.
I did recompile the DLL with a fix that works without having to set this setting, I could seed both fresh and saltwater, you can find it here on github: https://github.com/GreatWhiteMuffloN/Fish-Eggs-and-Pond-Stocking-fix/ just replace the files in the Assemblies folder with the ones in your mod folder.
(Be mindful of downloading random .DLL files from GitHub, the source is included and how it was built if you want to do it yourself)
@ProgrammerLily Feel free to include the code if it pleases you.
Spawned on a coastal tile, tried to seed salt water fish, no go sadly, I even tried seeding what was already in the ocean and same error :(
I'm seeing no seed water source after I spawned it with dev mod.
Log: https://gist.github.com/HugsLibRecordKeeper/f3f08064e4da724e6113b6f3a416cbb2
System.NullReferenceException: Object reference not set to an instance of an object