I had the engine error today when I tried to access engine #1. Never ever did a lash-up but I did notice yesterday that there was a (L) next to engine #1. After pulling my hair out (not much left to pull) and hours of frustration, I read this thread. Removed all the engines then re-entered them on the remote. Problem solved. I guess I will never figure out how the lash-up came to being.
Thanx guys for, once again, bailing me out.