Whatsapp not opening on my iPhone 4s?

I started it but crashed and closed suddenly. There's and update (2.11.11) available for it, however, I didn't' updated it yet. Moreover, it has been a very heavy app.of about 730 MB.is this the reason for all this happening? Please My iPhone 4s is currently running on iOS 7.1(11D167). Thnkz.;)!

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