Why won't my 2002 Volkswagen Cabrio start?

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My 2002 Volkswagen Cabrio will not start, but will crank. It was running perfectly normal all day. I have been driving it back and forth between class and home all day, and no problems. However, when I went to start my car tonight it would not start, but only crank. The engine is getting fuel. We checked all the fuses, fluids, warning lights ect. We still can't figure out why it will not start. If someone could give me some tips or help that would be great.