I realized what the problem is! If anyone encounters the same mistake, just go from a mod to a mod and add them to the Mods folder and you will see ones that are incompatible, just remove them and others will run smoothly!
Glad you got it working! The mods didn't cause that error though. That happens when updating to SMAPI 2.8 manually, so you still have old SMAPI files in the game folder. Just running the SMAPI installer will fix that (it'll clean up previous versions automatically). If you want to migrate from SMAPI 2.7 to 2.8 manually, you should delete these files in your game folder: 0Harmony.dll, 0Harmony.pdb, Mono.Cecil.dll, Newtonsoft.Json.dll, and all files starting with StardewModdingAPI. On Linux/Mac only, you should also delete System.Numerics.dll and System.Runtime.Caching.dll. Then reinstall SMAPI, and it should work fine. (That's only needed for SMAPI 2.8, since it moved its files.)
