Default Error while restoring whatsapp messages.

I am usingSamsung Galaxy Y pro Duos. GT 5512.
To install Whatsapp+ I had to uninstall whatsapp. I am not able to install Whatsapp+ (and Yes I am installing GB variant of Whatsapp+). It shows "Application not installed".
Now when I have installed original Whatsapp. I am asked to restore from the backup. When I tap on restore, it Crashes at 84% and shows a error. I don't want to lose the backup.

PS1: I have managed to solve the crashing problem' see the solution in the posts down.
PS2: I am still unable to get Whatsapp+ installed. It says "Application not Installed. Can anybody help in this regard?
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