Help! Object reference not set to a...

[BouncySWBF2]

I am trying to use the Heavy Mandalorian mod and it says this:

Object reference not set to an instance of an object.

at Frosty.ModSupport.FrostyModExecutor.<>c__DisplayClass29_0.<Run>b__0()

at System.Threading.Tasks.Task.Execute()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at Frosty.ModSupport.FrostyModExecutor.<Run>d__29.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

at FrostyModManager.MainWindow.<launchButton_Click>d__13.MoveNext()

--- End of stack trace from previous location where exception was thrown ---

at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Please assist!