Error when I try to use 64 bit Emulator

What do? just wanna play mkx

************ Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
at x360ce.App.MainForm.MainForm_KeyDown(Object sender, KeyEventArgs e)
at System.Windows.Forms.Control.OnKeyDown(KeyEventArgs e)
at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m)
at System.Windows.Forms.Form.ProcessKeyPreview(Message& m)
at System.Windows.Forms.Control.ProcessKeyMessage(Message& m)
at...

Error when I try to use 64 bit Emulator