Hi, when asking for help with mods; please always post a full log via:
https://smapi.io/log/
From what little of the error I can see from the screenshot. It says, as you mentioned; that you installed SDV Expanded incorrectly, and are missing its dependencies.
---
SDV Expanded:
https://www.nexusmods.com/stardewvalley/mods/3753?tab=description
If you go to the mod page, scroll down, and click "Requirements".
You'll see a section that says "Nexus requirements" with the following 10 mods below it:
Code:
Content Patcher (Framework Mod) This is what most of the mod is written for.
Custom NPC Exclusions (Framework Mod) Prevents certain NPC actions.
Expanded Preconditions Utility (Framework Mod) Required for Json Assets to function.
Extra Map Layers (Framework Mod) Allows extra layers to be drawn on maps.
Farm Type Manager (FTM) (Framework Mod) This mod allows custom forage, debris, and monsters to function.
Json Assets (Framework Mod) Allows the addition of new weapons, fish, and objects.
SAAT - Audio API and Toolkit (Framework Mod) Allows new audio to be added to the game.
Shop Tile Framework (Framework Mod) Allows custom shops to function.
SMAPI - Stardew Modding API (Framework Mod) SMAPI is required for any of this to work.
SpaceCore (Framework Mod) Allows Json Assets to function correctly.
It has links directly to those mods, and you need to install all these to run SDV Expanded.
Try that; if you still have issues. Please post a log via the site I linked at the top.