E1 just means wrong input, so it is a general error.
Firstly, try this:
Turn power off at wall
Turn key to P mode
Hold down SUBTOTAL while you turn power on at wall
Turn back to REG mode and try it again.
If you get a 'CLOSED' message, then you will need to log in.
Make sure you aren't using a decimal point if you are inputting prices as this can cause the error also.
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If anyone needs / looking for a Samsung ER-4940 manual, c-tech has one here:
http://the-checkout-tech.com/manuals/cashregisters/Samsung_ER-4940_dealer_pocket_programming_guide_manual.html
Registerman, August 2010
