Toad for MySQL Error Message error opening the program

Hi there,
I have this error when I want to launch Toad for MySQL and these are the errors. I don’t have a solution for this and a friend of mine recommended this experts website where I can get some help. Please, can anyone help me please to fix this ? Why I have this error ?
Thank you !

Toad for MySQL 6.3.0.642
System.AccessViolationException
Invalid pointer
Stack Trace:
At QP5Proc16(Int32, Void*, Int32, Int32)
At Quest.QP5.Shell.GetBuiltinFormatter()
At Quest.Toad.Formatting.SqlFormatter.UpdateDefaultFormatter()
At Quest.Toad.Loading.InitStep.PerformStep()
At Quest.Toad.Loading.AssemblyInitBackground()
OK
