I can not close the program

Every time I try to close the program a traditional mode, it displays the following error message:

Unhandled exception:
Exception has been thrown by the target of an invocation.

Detalhes:

System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.UnauthorizedAccessException: Access to the path "/home/arthu/.config/Pinta/layouts.xml" is denied.
  at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, Boolean anonymous, FileOptions options) <0x7f112b15d2c0 + 0x005ed> in <filename unknown>:0
  at System.IO.FileStream..ctor (System.String path, FileMode mode, FileAccess access, FileShare share) <0x7f112b15cf30 + 0x0004b> in <filename unknown>:0
  at (wrapper remoting-invoke-with-check) System.IO.FileStream:.ctor (string,System.IO.FileMode,System.IO.FileAccess,System.IO.FileShare)
  at System.Xml.XmlTextWriter..ctor (System.String filename, System.Text.Encoding encoding) <0x41edb140 + 0x00048> in <filename unknown>:0
  at MonoDevelop.Components.Docking.DockFrame.SaveLayouts (System.String file) <0x41edb070 + 0x00053> in <filename unknown>:0
  at Pinta.MainWindow.SaveUserSettings () <0x41edabe0 + 0x00067> in <filename unknown>:0
  at Pinta.MainWindow.<MainWindow>m__1 (System.Object , System.EventArgs ) <0x41edabc0 + 0x0000f> in <filename unknown>:0
  at Pinta.Core.FileActions.RaiseBeforeQuit () <0x41edab80 + 0x0002d> in <filename unknown>:0
  at Pinta.Actions.ExitProgramAction.Activated (System.Object sender, System.EventArgs e) <0x41ed95d0 + 0x000ab> in <filename unknown>:0
  at (wrapper managed-to-native) System.Reflection.MonoMethod:InternalInvoke (System.Reflection.MonoMethod,object,object[],System.Exception&)
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x7f112b1ab9e0 + 0x000a1> in <filename unknown>:0
  --- End of inner exception stack trace ---
  at System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) <0x7f112b1ab9e0 + 0x000ef> in <filename unknown>:0
  at System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) <0x7f112afe3cf0 + 0x0002a> in <filename unknown>:0
  at System.Delegate.DynamicInvokeImpl (System.Object[] args) <0x7f112b263f60 + 0x0024c> in <filename unknown>:0
  at System.MulticastDelegate.DynamicInvokeImpl (System.Object[] args) <0x7f112b26c040 + 0x00035> in <filename unknown>:0
  at System.Delegate.DynamicInvoke (System.Object[] args) <0x7f112b263e80 + 0x00019> in <filename unknown>:0
  at GLib.Signal.ClosureInvokedCB (System.Object o, GLib.ClosureInvokedArgs args) <0x41e2f4b0 + 0x00153> in <filename unknown>:0
  at GLib.SignalClosure.Invoke (GLib.ClosureInvokedArgs args) <0x41e2f470 + 0x0002f> in <filename unknown>:0
  at GLib.SignalClosure.MarshalCallback (IntPtr raw_closure, IntPtr return_val, UInt32 n_param_vals, IntPtr param_values, IntPtr invocation_hint, IntPtr marshal_data) <0x41e2de00 + 0x002bb> in <filename unknown>:0