why is the question cannot allocate memory coming up?
why do i get the message cannot allocate memory?
iOS 6.0.1
The article you attached is not relevant as it pertains to Macs.
Try resetting your iPad. Hold the sleep/wake and home buttons together for 7 or 8 seconds till the Apple logo appears.
You probably had too many open applications, some of which have been open for a very long time, containing a lot of data.