'currentCtx' is undefined

While trying to create/upload a docume开发者_JAVA技巧nt in a document library, Ie throws the below exception

'currentCtx' is undefined

what it means and how to fix this?

That's a javascript variable used in SharePoint menus and list views. It's defined at the top of core.js - if it is showing up as undefined you most likely have either a problem loading scripts or something on the page is causing the initialization scripts not to run correctly.