Error 11?

Hi guys,

I have a Error 11 appearing on my screen. 

This is really urgent. I am currently putting the finishing touches to my 28th book and I need to send it to my printer in two days time. 

Don’t know if this is related but I was using a Samsung external drive to back up my book and decided to scan the drive for viruses.  The drive was still preparing itself after half an hour and having scrolled through 78,900 files.  It was longer than I thought so I canceled the down load and removed the plug.

Went back to my book and got this message.

I hope you can help

Kind Regards

Greg McDonald