Getting this error message when starting a save:

The Mod O:\Steam\steamapps\workshop\content\255710\928128676 [0Harmony.dll, ImprovedPublicTransport2.dll] has caused an error [ModException]

Details:
System.Exception: Exception from HarmonyInstance "github.com/bloodypenguin/ImprovedPublicTransport" ---> System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary.
at System.Collections.Generic.Dictionary`2[System.String,System.Reflection.Emit.LocalBuilder].get_Item (System.String key) [0x00000] in <filename unknown>:0
at Harmony.MethodPatcher.EmitCallParameter (System.Reflection.Emit.ILGenerator il, System.Reflection.MethodBase original, System.Reflection.MethodInfo patch, System.Collections.Generic.Dictionary`2 variables, Boolean allowFirsParamPassthrough) [0x00000] in <filename unknown>:0
at Harmony.MethodPatcher+<>c__DisplayClass20_0.<AddPostfixes>b__1 (System.Reflection.MethodInfo fix) [0x00000] in <filename unknown>:0
at Harmony.CollectionExtensions.Do[MethodInfo] (IEnumerable`1 sequence, System.Action`1 action) [0x00000] in <filename unknown>:0
at Harmony.MethodPatcher.AddPostfixes (System.Reflection.Emit.ILGenerator il, System.Reflection.MethodBase original, System.Collections.Generic.List`1 postfixes, System.Collections.Generic.Dictionary`2 variables, Boolean passthroughPatches) [0x00000] in <filename unknown>:0
at Harmony.MethodPatcher.CreatePatchedMethod (System.Reflection.MethodBase original, System.String harmonyInstanceID, System.Collections.Generic.List`1 prefixes, System.Collections.Generic.List`1 postfixes, System.Collections.Generic.List`1 transpilers) [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at Harmony.MethodPatcher.CreatePatchedMethod (System.Reflection.MethodBase original, System.String harmonyInstanceID, System.Collections.Generic.List`1 prefixes, System.Collections.Generic.List`1 postfixes, System.Collections.Generic.List`1 transpilers) [0x00000] in <filename unknown>:0
at Harmony.PatchFunctions.UpdateWrapper (System.Reflection.MethodBase original, Harmony.PatchInfo patchInfo, System.String instanceID) [0x00000] in <filename unknown>:0
at Harmony.PatchProcessor.Unpatch (System.Reflection.MethodInfo patch) [0x00000] in <filename unknown>:0
at Harmony.HarmonyInstance.Unpatch (System.Reflection.MethodBase original, System.Reflection.MethodInfo patch) [0x00000] in <filename unknown>:0
at Harmony.HarmonyInstance+<>c__DisplayClass11_1.<UnpatchAll>b__1 (Harmony.Patch patchInfo) [0x00000] in <filename unknown>:0
at Harmony.CollectionExtensions.Do[Patch] (IEnumerable`1 sequence, System.Action`1 action) [0x00000] in <filename unknown>:0
at Harmony.CollectionExtensions.DoIf[Patch] (IEnumerable`1 sequence, System.Func`2 condition, System.Action`1 action) [0x00000] in <filename unknown>:0
at Harmony.HarmonyInstance.UnpatchAll (System.String harmonyID) [0x00000] in <filename unknown>:0
at ImprovedPublicTransport2.ImprovedPublicTransportMod.Deinit () [0x00000] in <filename unknown>:0
at ImprovedPublicTransport2.ImprovedPublicTransportMod.OnLevelUnloading () [0x00000] in <filename unknown>:0
at LoadingWrapper.OnLevelUnloading () [0x00000] in <filename unknown>:0