keep getting this error
[11:04:26 ERROR SMAPI] A mod failed handling the SaveEvents.AfterLoad event:
System.ArgumentException: Illegal characters in path.
at System.IO.Path.CheckInvalidPathChars(String path, Boolean checkAdditional)
at System.IO.Path.Combine(String path1, String path2)
at CustonFarming.SaveHandler.doesSavFileExist(String name, UInt64 GID, String PN) in C:\Users\David\Documents\GitHub\Stardew-Valley-Mods\CustomFarming\SaveHandler.cs:line 135
at CustomFarming.SaveHandler.loadFromFile(String modSaveName) in C:\Users\David\Documents\GitHub\Stardew-Valley-Mods\CustomFarming\SaveHandler.cs:line 116
at CustomFarming.customFarmingMod.load() in C:\Users\David\Documents\GitHub\Stardew-Valley-Mods\CustomFarming\SaveHandler.cs:line 178
at CustomFarming.customFarmingMod.<Entry>b_5_2(Object x, EventArgs y) in C:\Users\David\Documents\GitHub\Stardew-Valley-Mods\CustomFarming\SaveHandler.cs:line 37
at StardewModdingAPI.Framwork.InternalExtensions.SafelyRaisePlainEvent(IMonitor monitor, String name, IEnumerable 1 handlers, Object sender, EventArgs args) in D:\source\_Stardew\SMAPI\src\StardewModdingAPI\Framwork\InternalExtensions.cs:line 40