Windows [BUG] Co-Op Crashing Game

[smallfrog]

I bought my boyfriend a copy of Stardew Valley so we could play together. Trying to load into the co-op game, however, crashed his game entirely. His normal play mode was still functional, so I assumed it must have to do with the fact that I had mods installed and he didn't. So I went and got rid of all my mods, and ran it through the client directly again just to be safe.
Now my game is also crashing when I try to open the co-op world.
My older co-op worlds were non-functional as well.
I received this error message:

Message: Unable to read beyond the end of the stream.
InnerException:
Stack Trace: at StardewValley.SaveGame.getLoadEnumerator(String file)+MoveNext() in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\SaveGame.cs:line 1828
at StardewValley.Game1.UpdateTitleScreen(GameTime time) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Game1.cs:line 6307
at StardewValley.Game1._update(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Game1.cs:line 4906
at StardewValley.Game1.Update(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Game1.cs:line 3974
at StardewValley.GameRunner.Update(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\LocalMultiplayer.cs:line 1067
at Microsoft.Xna.Framework.Game.DoUpdate(GameTime gameTime) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\MonoGame.Desktop\MonoGame.Framework\Game.cs:line 814
at Microsoft.Xna.Framework.Game.Tick() in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\MonoGame.Desktop\MonoGame.Framework\Game.cs:line 567
at Microsoft.Xna.Framework.SdlGamePlatform.RunLoop() in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\MonoGame.Desktop\MonoGame.Framework\Platform\SDL\SDLGamePlatform.cs:line 91
at Microsoft.Xna.Framework.Game.Run(GameRunBehavior runBehavior) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\MonoGame.Desktop\MonoGame.Framework\Game.cs:line 481
at StardewValley.Program.Main(String[] args) in C:\GitlabRunner\builds\Gq5qA5P4\0\ConcernedApe\stardewvalley\Farmer\Farmer\Program.cs:line 175

Game Version: 1.5.6 Hotfix #3
SDK Helper: SteamHelper
Game Language: en
GPU: GeForce GTX 1660 Ti/PCIe/SSE2
OS: Win32NT Microsoft Windows NT 10.0.18363.0
In-game Date: spring 2 Y1 Time of Day: 600
Game Location: FarmHouse

 

[GreaterDane]

Likely caused by mods, some may make your save game incompatible with vanilla Stardew Valley. Please take your issue to the Mod Support section: https://forums.stardewvalley.net/forums/mod-support.29/