needofrspeedpayback Help with mods

[BlagoXBG]

whenever i try to start nfs payback with frosty mod manager it says this:

 

Access to the path 'cas.cat' is denied.

at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
at System.IO.FileInfo.Delete()
at Frosty.ModSupport.FrostyModExecutor.RecursiveDeleteFiles(String path)
at Frosty.ModSupport.FrostyModExecutor.RecursiveDeleteFiles(String path)
at Frosty.ModSupport.FrostyModExecutor.RecursiveDeleteFiles(String path)
at Frosty.ModSupport.FrostyModExecutor.RecursiveDeleteFiles(String path)
at Frosty.ModSupport.FrostyModExecutor.DeleteSelectFiles(String modPath)
at Frosty.ModSupport.FrostyModExecutor.<>c__DisplayClass28_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__28.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)