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If you're getting a new error and need help, you should print the full error message here as well as show the lines of text involved. At this point we shouldn't have to be reminding you to do this.

What type of variable is hei?

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Note: I know the answer to this question, but I want YOU to see why this is important. ;)

First and foremost, I think that you'll want to go into detail on just what problems you may be having. The better and more informative your question, usually the better and more informative our...