A Mod caused an error [System.Exception]

Details:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> ColossalFramework.GameSettingsException: System.ArgumentException An element with the same key already exists in the dictionary. ---> System.ArgumentException: An element with the same key already exists in the dictionary.
at System.Collections.Generic.Dictionary`2[System.String,ColossalFramework.SettingsFile].Add (System.String key, ColossalFramework.SettingsFile value) [0x00000] in <filename unknown>:0
at ColossalFramework.GameSettings.InternalAddSettingsFile (ColossalFramework.SettingsFile[] settingsFiles) [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at ColossalFramework.GameSettings.InternalAddSettingsFile (ColossalFramework.SettingsFile[] settingsFiles) [0x00000] in <filename unknown>:0
at ColossalFramework.GameSettings.AddSettingsFile (ColossalFramework.SettingsFile[] settingsFiles) [0x00000] in <filename unknown>:0
at ForestBrush.UserMod.InstallOutOfGameDependencies () [0x00000] in <filename unknown>:0
at ForestBrush.UserMod.OnEnabled () [0x00000] in <filename unknown>:0
at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (object,object[],System.Exception