From: http://www.appliancefactoryparts.com/blog/2010/02/washing-machine-fault-codes/

From: http://www.lg.com/us/support/answers/washers/control-panel#errorcodes

From: http://russ.alman.us/2011/02/13/fix-error-code-le-lg-front-load-washing-machine/

Fix for Error Code “LE” on LG Front Load Washing Machine

While the online forums indicated this might be a problem with a sensor, I was able to solve the problem by doing the following:

• Press the Power button
• Manually rotate the hopper 4 times clockwise and 4 times counter-clockwise.
• Press the power button and run the machine normally.

Don't know if this will work for everyone, but it worked for me. If I keep getting the error message, I'll have to call LG and find out about this sensor I was reading about.