Error in Event Log need Help! "An unhandled exception ('System.IO.FileLoadException') occurred in SqlLogShip.exe [6576]. "

The server is windows 2012 + SQL 2012 sp1 (11.0.3000 web edition) using AWS EC2 instance. 

The sqlLogShip versin is 11.0.2100.60.

We have just setup two sql server doing log shipping every 5 mins.

I got following error every few minutes.

An unhandled exception ('System.IO.FileLoadException') occurred in SqlLogShip.exe [6400]. Just-In-Time debugging this exception failed with the following error: Debugger could not be started because no user is logged on.

Check the documentation index for 'Just-in-time debugging, errors' for more information.

Not sure how to fix this, I can't find any answer from google/Bing.

Thanks for any help!

mulder