Common mistakes made by startups

I just read an article that summed up some common mistakes when starting a business that rung true to me. They mentioned the following (which I've put in the order I think is most important):

1. Not focusing on the user


2. Not having enough infrastructure (money + time)


3. Forgetting about branding, marketing and sales


4. Trying to do everything (similar to #2)


5. Staying in "Stealth Mode" too long

Have a look at the original article here:
http://startupspark.com/the-5-most-common-mistakes-made-by-startups/