Download/update my apps, "An unknown error has occurred." message.

I have an iPhone 4S, and when i try to download/update my apps using the phone, i get an "An unknown error has occurred" message. What's going on and what do i do to fix it?
Help! I don't want to delete everything and start from factory default again

Hi
I had the same issue on my iPhone, to resolve this I did a Backup/Restore on the device with iTunes. After this I could download apps on the device again...
//Jonas

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