I've found that the unmodded version of the game with the same save file works fine, i have uninstalled and reinstalled both the game and SMAPI.
If you have any tips on how to fix this i would appreciate it, thank you!
It seems that you have some mod incompatibility, you will have to find wich ones. The error is caused because one mod define some value and another one tries to define the same value.
Step 1: Find one of the mod:
Step 2: Find the other one:
Now that you know the 2 mods that cause the error, you can : - Change mod's loading order. (Not sure if it will work) - Try to warn developpers of the mods thats there is some incompatibility. - Disable one and play without it.