Hello my name is***** do not rate until we are finished. I look forward to assisting and am very sorry to hear that you are having this problem. How old is it? When on Err how did you clear it? Did it show a number as well?
Ok that is why I asked actually with no number the error means there is an issue with either the lens or the lens contacts on the camera body. The electrical contacts can also cause your new problem. Have you tried cleaning it yet?
A lint free cloth and either a tiny amount of warm water or alcohol will work. Do not put the lens back on until both are completely dry. Let me know the results when you can.