Facebook app and what's app issues

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Sep 3, 2015 3:15:19 PM via Website

My what's app app has been failing to update recently but I've been using as normal. Yesterday my facebook app wouldn't open and kept crashing. So I decided to un install both. Whats app won't re install at all, Facebook will but the same problem persists. Whats app says " package file invalid" error. I've tried DL the what's app from the browser instead of play store but same sinario. I've cleared cache and data, re booted phone etc. Everything else working fine.
Please help