If you tried to read resistance (Ohms) on a powered circuit, you may have fried your meter. Try setting your meter to ohms and short to two meter leads together and see if you get 0 ohms (or very close to it). If so, set it to AC voltage and try measuring a wall outlet for 120 VAC. If that works, maybe it's ok after all. Try a low DC Volts scale with a dry cell and see if it still reads correctly.
If all of that checks out, go back and check your element resistance with nothing connected for 10 ohms or so. If good, connect your leads and power it up with water covering the element and check for 240 VAC at the element. If good, it should be heating. If you don't have 240 VAC at your element but you DO have 120 VAC from either side to ground (or neutral), then you have a wiring or other problem.....