Thank you for reporting this. As the error message says, this is an internal error detected by auto-diagnostic routines. Actually, when the message is shown the problem has been neutralized an cannot propagate, so everything is running normally. For safety, however, one should always save everything and close the application when this happens.
This should never happen, of course, but life is not perfect
Unless you see this error message again or detect a repeatable pattern, just don't care about it. Things that happen.
