I'm getting the same error. I got it after updating smapi and a few other mods (UI info suite, Custom Farming Redux, Custom Element Handler, and PyTK, if that has anything to do with it.) log here, in case it's needed: https://log.smapi.io/0db9AMVi
your config.json file will be in the same folder as the mod's folder. Just run Stardew Valley and Quit on the title screen, and it will be there.
Also, Thank you Pathoschild and all for your contributions!!! You can now update Part of the Community at Nexus: https://www.nexusmods.com/stardewvalley/mods/923
bmarquis updated Part of the Community with a new update entry: Support for SMAPI 3.0 / Stardew Valley 1.3.36 Read the rest of this update entry...