Hi Pankaj,
I updated a number of plugins. When I tried to edit a page, I received a white screen. At this point I deactivated plugins one by one and it began to work again when I deactivated Meta Generator.
Unfortunately, I am not particularly technical so I’m not sure I can give you any more useful information. I just wanted to let you know.
Please do let me know if I can help in anyway.
Cheers,
Ed