You posted an update for the Stardew Valley beta, but it looks like you might have an older beta version? It's still not compatible with the latest versions.
Loading mods... Crab Net (CrabNet 584\CrabNet.dll)... Broken code in CrabNet.dll: reference to StardewValley.Farmer.professions (field returns NetList, not List).
52 comments
https://community.playstarbound.com/threads/updating-mods-for-stardew-valley-1-4.156000/page-3
-anon
https://forums.stardewvalley.net/threads/unofficial-mod-updates.2096/page-27#post-23797
https://mods.smapi.io/#Crab_Net
Loading mods...
Crab Net (CrabNet 584\CrabNet.dll)...
Broken code in CrabNet.dll: reference to StardewValley.Farmer.professions (field returns NetList, not List).